FOOTNOTES:
[a] That the Muscles are compounded of Fibres, is visible enough. Which Fibres, the curious and ingenious Borelli saith, are cylindraceous; not hollow, but filled with a spungy, pithy Substance, after the manner of Elder, as he discovered by his Microscopes. Borel. de Mot. Animal. Part 1. These Fibres, he saith, are naturally white; but derive their Redness only from the Blood in them.
These Fibres do in every Muscle, (in the Belly at least of the Muscle,) run parallel to one another, in a neat orderly Form. But they do not at all tend the same Way, but some run aslant, some longways, &c. according to the Action or Position of each respective Muscle. The Particulars of which, and of divers other Observables in the Muscles, would, besides Figures, take up too much room in these Notes; and therefore I must refer to the Anatomists, particularly Steno, Borelli, Cowper, &c.
[] The infinite Creator hath generally exerted his Art and Care, in the Provision made by proper Muscles and Nerves, for all the different Motions in animal Bodies, both involuntary, and voluntary. It is a noble Providence that most of the vital Motions, such as of the Heart, Stomach, Guts, &c. are involuntary, the Muscles acting whether we sleep or wake, whether we will or no. And it is no less providential that some, even of the vital Motions, are partly voluntary, partly involuntary, as that for Instance, of Breathing, which is performed both sleeping and waking; but can be intermitted for a short Time on occasion, as for accurate hearing any Thing, &c. or can be encreased by a stronger Blast, to make the greater Discharges of the Blood from the Lungs, when that any Thing overcharges them. And as for the other Motions of the Body, as of the Limbs, and such as are voluntary, it is a no less Providence, that they are absolutely under the Power of the Will; so as that the Animal hath it in his Power to command the Muscles and Spirits of any part of its Body, to perform such Motions and Actions as it hath Occasion for.
[c] Quid dicam de Ossibus? quæ subjecta corpori mirabiles commissuras habent, & ad stabilitatem aptas, & ad artus finiendos accommodatas, & ad motum, & ad omnem corporis actionem. Cicer. de Nat. Deor. l. 2. c. 55.
By Reason it would be endless to mention all the Curiosities observable in the Bones, I shall for a Sample, single out only an Instance or two, to manifest that Design was used in the Structure of these Parts in Man.
The first shall be in the Back-Bone, which (among many others) hath these two Things remarkable. 1. Its different Articulations from the other Joynts of the Body. For here most of the Joynts are flat, and withal guarded with Asperities and Hollows, made for catching and holding; so as firmly to lock and keep the Joynts from Luxations, but withal to afford them such a Motion, as is necessary for the Incurvations of the Body. 2. The difference of its own Joynts in the Neck, Back and Loins. In the Neck, the Atlas, or upper Vertebra, as also the Dentata, are curiously made, and joynted (differently from the rest) for the commodious and easie bending and turning the Head every way. In the Thorax, or Back, the Joynts are more close and firm; and in the Loins, more lax and pliant; as also the Spines are different, and the Knobs and Sockets turned the quite contrary way, to answer the Occasions the Body hath to bend more there, than higher in the Back. I shall close this Remark with the ingenious Dr. Keil’s Observation.
The Structure of the Spine is the very best that can be contrived; for had it been all Bone, we could have had no Motion in our Backs; had it been of two or three Bones articulated for Motion, the Medulla Spinalis must have been necessarily bruised at every Angle or Joynt; besides, the whole would not have been so pliable for the several Postures we have occasion to put our selves in. If it had been made of several Bones without intervening Cartilages, we should have had no more Use of it, than if it had been but one Bone. If each Vertebra had had its own distinct Cartilages, it might have been easily dislocated. And lastly, The oblique Processes of each superior and inferior Vertebra, keep the middle one that it can neither be thrust backwards nor forwards to compress the Medulla Spinalis. Keil’s Anat. c. 5. §. 8.
Compare here what Galen saith of the Articulations, Ligaments, Perforation, &c. of the Spine, to prove the Wisdom and Providence of the Maker of animal Bodies, against such as found fault with Nature’s Works; among which he names Diagoras, Anaxagoras, Asclepiades and Epicurus. V. Galen. de Us. Part. L. 12. init. and Chap. 11, &c. also L. 13. init.
2. The next Instance shall be in one or two Things, wherein the Skeletons of Sexes differ. Thus the Pelvis made in the Belly by the Ilium, Ossa Coxendicis and Pubis, is larger in a Female than Male Skeleton, that there may be more room for the lying of the Viscera and Fœtus. So the Cartilage bracing together the two Ossa Pubis, or Sharebones, Bartholine saith, is twice thicker and laxer in Women than Men: As also is the Cartilage that tieth the Os Sacrum to its Vertebra; and all to give way to the Passage of the Fœtus.
Another considerable Difference is in the cartilaginous Production of the seven long Ribs, whereby they are braced to the Breast-Bone. These are harder and firmer in Women than in Men; the better to support the Weight of the Breasts, the sucking Infant, &c.
[d] It is remarkable in the Joynts, and a manifest Act of Caution and Design, 1. That altho’ the Motion of the Limbs be circular, yet the Center of that Motion is not in a Point, but an ample Superficies. In a Point, the Bones would wear and penetrate one another; the Joynts would be exceedingly weak, &c. but the Joynts consisting of two large Superficies, Concave and Convex, some furrowed and ridged, some like a Ball and Socket, and all lubricated with an oily Substance, they are incomparably prepared both for Motion and Strength. 2. That the Bones next the Joynt are not spungy, as their Extremities commonly are, nor hard and brittle, but capped with a strong, tough, smooth, cartilaginous Substance, serving both to Strength and Motion.
But let us here take notice of what Galen mentions on this Subject. Articulorum unusquisque Eminentiam Cavitati immissam habet: Veruntamen hoc fortasse non adeò mirabile est: Sed si, consideratâ omnium totius corporis ossium mutuâ connexione, Eminentias cavitatibus suscipientibus æquales semper inveneris; Hoc mirabile. Si enim justo amplior esset Cavitas, laxus sanè & infirmus fieret Articulus; si strictior, motus difficulter fieret, ut qui nullam versionem haberet; ac periculum esset non parvum, eminintias ossium arctatas frangi: sed horum neutrum factum est.——Sed quoniam ex tam securâ constructione periculum erat, nè motiones difficiliùs fierent, & eminentiæ ossium extererentur, duplex rursus auxilium in id Natura molita est. 1. Cartilagine os utrumque subungens, atque oblinens: alterum, ipsis Cartilaginibus humorem unctuosum, velut oleum, superfundens; per quem facilè mobilis, & attritu contumax omnis articulatio Ossium facta est.——Ut undique diligenter Articulus omnis custodiretur, Ligamenta quædam ex utroque osse produxit Natura. Galen de Us. Part. l. 1. c. 15.
[e] For the affording this oily or mucilaginous Matter, there are Glandules very commodiously placed near the Joynts, so as not to suffer too great Compression by the Motion of the neighbouring Bones, and yet to receive a due Pressure, so as to cause a sufficient Emission of the Mucilage into the Joynts. Also another Thing considerable is, that the excretory Ducts of the mucilaginous Glands have some Length in their Passage from the Glands to their Mouths; which is a good Contrivance, to prevent their Mouths being oppressed by the Mucilage, as also to hinder the too plentiful Effusion thereof, but yet to afford a due Expressure of it at all Times, and on all Occasions, as particularly in violent and long-continued Motions of the Joynts, when there is a greater than ordinary Expence of it. See Cowper’s Anat. Tab. 79.
[f] There is no doubt to be made, but that the Muscles receive their Motion from the Nerves. For if a Nerve be cut, or straightly bound, that goes to any Muscle, that Muscle shall immediately lose its Motion. Which is doubtless the case of Paralyticks; whose Nerves are some of them by Obstructions, or such like Means, reduced to the same State as if cut or bound.
And this also is the cause of that Numness or Sleepiness we find oftentimes, by long sitting or lying on any Part.
Neither is this a modern Notion only: For Galen saith, Principium Nervorum omnium Cerebrum est, & spinalis Medulla.——Et Nervi à Cerebro animalem virtutem accipiunt——Nervorum utilitas est facultatem Sensûs & Motûs à principio in partes diducere. And this he intimates to have been the Opinion of Hippocrates and Plato. De Us. Part. l. 1. c. 16. & passim.
[g] Dr. Willis thinks, that in the Brain the Spirits are elaborated that minister to voluntary Motion; but in the Cerebellum, such as effect involuntary, or natural Motions; such as that of the Heart, the Lungs, &c. Cerebri Anat. c. 15.
[] To the foregoing, I shall briefly add some Examples of the special Provision made for the Motion of some Animals by Temporary Parts. Frogs and Toads, in their Tadpole-state, have Tails, which fall off when their Legs are grown out. The Lacerta aquatica, or Water-Newt, when Young, hath four neat ramified Fins, two on a Side, growing out a little above its Fore-Legs, to poise and keep its Body upright, (which gives it the Resemblance of a young Fish,) which fall off when the Legs are grown. And the Nymphæ and Aureliæ, of all or most of the Insects bred in the Waters, as they have particular Forms, different from the Insects they produce; so have also peculiar Parts afforded them for their Motion in the Waters: Oars, Tails, and every Part adapted to the Waters, which are utterly varied in the Insects themselves, in their mature State in the Air.
[k] Jam verò alia animalia gradiendo, alia serpendo ad pastum accedunt, alia volando, alia nando. Cic. de Nat. Deor. l. 2. c. 47.
Compare also what Galen excellently observes concerning the Number of Feet in Man, and in other Animals; and the wise Provision thereby made for the Use and Benefit of the respective Animals. De Us. Part. in the beginning of the third Book.
[l] As I shall hereafter shew, that the indulgent Creator hath abundantly provided for the Safety of Animals by their Cloathing, Habitations, Sagacity and Instruments of Defence; so there appears to be a Contemperament of their Motion with these Provisions. They that are well armed and guarded, have commonly a slower Motion; whereas they that are destitute thereof, are swifter. So also timid helpless Animals are commonly swift; thus Deer and Hares: But Animals endowed with Courage, Craft, Arms, &c. commonly have a slower Motion.
[n] See [Book VII. Chap. 1.] the end.
[o] See [Book IX. Chap. 1. Note (c).]
[p] Siquis unquam alius Opifex, æqualitatis & proportionis magnam habuit providentiam, certè Natura habuit in animalium corporibus conformandis; unde Hippocrates eam rectissimè justam nominat. Galen. de Us. Part. l. 2. c. 16.
[q] The Make of the Bodies of some Water-fowl, seems to contradict what I here say, the Heads and long Necks of some, as of Swans, Ducks and Geese; and the hinder Parts of others, as of the Doucker and More-hen, and some other Kinds, seeming to be too heavy for the rest of their Body. But instead of being an Argument against, it is a notable Instance of, the divine Art and Providence, these Things being nice Accommodations to their way of Life. Of such as have long Necks, see [Book VII. Chap. 2. Note (i).]
And as for such whose hinder Parts seem to over-balance their foremost Parts, whereby they fly with their Bodies in a manner erect, this also is an excellent Accommodation to their way of Life, which is Diving rather than Flying. Vid. [Book VII. Chap. 4. Note (k).]
[r] See [Book V. Chap. 2. Note (h).]
CHAP. IX.
Of the Place allotted to the several Tribes of Animals.
Having dispatched the Motion of Animals, let us in the next Place consider the Place which the infinitely wise Creator hath appointed them to move and act, and perform the Offices of the Creation in. And here we find every Particular well ordered. All Parts of our Terraqueous Globe fit for an Animal to live and act in, are sufficiently stocked with proper Inhabitants: The watery Element (unfit, one would think, for Respiration and Life) abounding with Creatures fitted for it; its Bowels abundantly stored, and its Surface well bespread. The Earth also is plentifully stocked in all its Parts, where Animals can be of any Use; not probably the deepest Bowels thereof indeed, being Parts in all likelihood unfit for Habitation and Action, and where a living Creature would be useless in the World; but the Surface every where abundantly stored.
But that which is most considerable in this Matter, and plainly sheweth the divine Management in the Case, is, that those Creatures are manifestly designed for the Place in which they are, and the Use and Services they perform therein. If all the Animals of our Globe had been made by Chance, or placed by Chance, or without the divine Providence, their Organs would have been otherwise than they are, and their Place and Residence confused and jumbled. Their Organs (for Instance) of Respiration, of Vision, and of Motion, would have fitted any Medium, or have needed none; their Stomachs would have served any Food, and their Blood, and Covering of their Bodies been made for any Clime, or only one Clime. Consequently all the Animal World would have been in a confused, inconvenient, and disorderly Commixture. One Animal would have wanted Food, another Habitation, and most of them Safety. They would have all flocked to one, or a few Places, taken up their Rest in the Temperate Zones only, and coveted one Food, the easiest to be come at, and most specious in shew; and so would have poisoned, starved, or greatly incommoded one another. Bur as the Matter is now ordered, the Globe is equally bespread, so that no Place wanteth proper Inhabitants, nor any Creature is destitute of a proper Place, and all Things necessary to its Life, Health, and Pleasure. As the Surface of the Terraqueous Globe is covered with different Soils, with Hills and Vales, with Seas, Rivers, Lakes and Ponds, with divers Trees and Plants, in the several Places; so all these have their Animal Inhabitants, whole Organs of Life and Action are manifestly adapted to such and such Places and Things; whose Food and Physick, and every other Convenience of Life, is to be met with in that very Place appointed it. The watery, the amphibious[a], the airy Inhabitants, and those on the dry Land Surface, and the Subterraneous under it, they all live and act with Pleasure, they are gay, and flourish in their proper Element and allotted Place, they want neither for Food, Cloathing, or Retreat; which would dwindle and die, destroy, or poison one another, if all coveted the same Element, Place, or Food.
Nay, and as the Matter is admirably well ordered, yet considering the World’s increase, there would not be sufficient Room, Food, and other Necessaries for all the living Creatures, without another grand Act of the divine Wisdom and Providence, which is the Balancing the Number of Individuals of each Species of Creatures, in that Place appointed thereto: Of which in the next Chapter.