FOOTNOTES:
[6] From a work entitled "Scenes of Italian Life," by L. Mariotti, just published in London.
A PLEA FOR BRITISH REPTILES.
What the flourishing tradesman writes with pride over his shop, we might in most cases write over our storehouse of antipathies—established in 1720, or 1751. For what good reason we, in 1851, should shudder at the contact of a spider, or loathe toads, it would be hard to say. Our forefathers in their ignorance did certainly traduce the characters of many innocent and interesting animals, and many of us now believe some portions of their scandal. To be a reptile, for example, is perhaps the greatest disgrace that can attach to any animal in our eyes. Reptile passes for about the worst name you can call a man. This is unjust—at any rate, in England. We have no thought of patting crocodiles under the chin, or of embracing boa constrictors; but for our English reptiles we claim good words and good-will. We beg to introduce here, formally, our unappreciated friends to any of our human friends who may not yet have cultivated their acquaintance.
The Common Lizard—surely you know the Common Lizard, if not by his name of state—Zootoca vivipara. He wears a brilliant jacket, and you have made friends with him, as a nimble, graceful fellow; as a bit of midsummer. His very name reminds you of a warm bank in the country, and a sunny day. Is he a reptile? Certainly; suppose we stop two minutes to remember what a reptile is.
The heart of a reptile has three cavities; that is to say, it is not completely double, like our own. It sends only a small part of the blood which comes into it for renovation into the air-chambers—the lungs; while the remainder circulates again unpurified. That change made in the blood by contact with the oxygen of air, is chiefly the cause of heat in animals. Aëration, therefore, being in reptiles very partial, the amount of heat evolved is small; reptiles are therefore called cold-blooded. They are unable to raise their heat above the temperature of the surrounding air. Fishes are cold-blooded, through deficient aëration in another way; in them, all the blood passes from the heart into the place where air shall come in contact with it; but, then there is a limitation to the store of air supplied, which can be no more than the quantity extracted from the water. The temperature of water is maintained below the surface, and we know how that of the air varies, since a certain quantity of heat is necessary to the vital processes; reptiles, depending upon air for heat, hybernate or become torpid when the temperature falls below a certain point. The rapidity of all their vital actions will depend upon the state of the thermometer; they digest faster in the heat of summer than in the milder warmth of spring. Their secretions (as the poison of the adder) are in hot weather more copious, and in winter are not formed at all. The reptiles breathe, in all cases, by lungs; but we must except here those called Batrachians, as frogs or newts, which breathe, in the first stage, by gills, and afterward by gills and lungs, or by lungs only. The Batrachians, again, are the only exception to another great characteristic of the reptile class, the hard, dry covering of plates or scales. The reptiles all produce their young from eggs, or are "oviparous"—some hatch their eggs within the body, and produce their young alive, or are "ovo-viviparous." These are the characters belonging to all members of the reptile-class. The class is subdivided into orders somewhat thus: 1. The Testudinate (tortoises and turtles). 2. Enaliosaurian (all fossil, the Ichthyosaurus and his like). 3. Loricate (crocodiles and alligators). 4. Saurian (lizards). 5. Ophidian (serpents); and the last order, Batrachian (frogs, toads, &c.); which is, by some, parted from the reptiles, and established as another class.
Now we have in England no tortoises or turtles, and no crocodiles: and the fossil order is, in all places, extinct; so our reptiles can belong only to the three last-named orders, Lizards, Serpents, and Batrachians.
Thus we come back, then, to our Lizards, of which we have among us but two genera, a single species of each. These are the Common Lizard, well known to us all, and the Sand Lizard, known only to some of us who happen to live upon the southern coast. The species of lizard so extremely common in this country, has not been found in countries farther south, and is, in fact, peculiar to our latitude. We, therefore, may love him as a sympathetic friend. The sand lizard (Lacerta agilis) is found as far north as the country of Linnæus, and as far south as the northern part of France; in England, however, it seems to be rare, and has been detected only in Dorsetshire—chiefly near Poole, or in some other southern counties. It frequents sandy heaths, and is of a brown sandy color, marked and dotted; but there is a green variety said to be found among the verdure of marshy places. It is larger than our common lizard, averaging seven inches long, is very timid, and when made a prisoner pines and dies. Its female lays eggs, like a turtle, in the sand, covers them over, and leaves them to be hatched by the summer sun. This kind of lizard, therefore, is oviparous. The eggs of our common lizard are hatched also by the sun; for, reptiles having no heat of their own, can not provide that which is necessary to the development of an embryo; but in this case the sun hatches them within the parent's body. The female of this lizard stretches herself out upon a sunny bank, and lets the bright rays fall upon her body while she lies inactive. At this period, she will not move for any thing less than a real cause of alarm. She is not sunning herself lazily, however, but fulfilling an ordinance of God. The eggs break as the young lizards—three to six—are born. This lizard is, therefore, ovo-viviparous. The little ones begin at once to run about, and soon dart after insects, their proper food; but they accompany the mother with some instinct of affection for a little time. These lizards are very various in size and color; difference in these respects does not denote difference in kind. The little scales which cover them are arranged in a peculiar manner on the head, under the neck, &c.; and some differences of arrangement, in such respects, are characteristic. The best distinction between the only two species of lizard known in this country has been pointed out by Mr. Bell. In the hind legs, under each thigh, there is a row of openings, each opening upon a single scale. In sand lizards, the opening is obviously smaller than the scale; in our common lizards, the opening is so comparatively large that the scale seems to be the mere edge of a tube around it.
These are our lizards, then, our Saurian reptiles; and they do not merit any hate. Suffer an introduction now to English Snakes.