SECT. XI.—ON THE LOSS OF MEMORY AND OF REASON; ON CARUS AND FATUITY.
The loss of memory sometimes occurs by itself, and sometimes along with impairment of the reason, as an impairment of the reason sometimes happens first by itself, and is then followed by that of the memory. When both suffer, the affection called fatuity is formed. These complaints have for a cause the exciting intemperament; but, if it is humid only, it will occasion impairment of the memory and reason, torpidity, drowsiness, long and deep sleep; but if complicated with coldness, it will produce carus and lethargy. In like manner, dryness alone brings on watchfulness, but when joined with heat, delirium and frenzy. These intemperaments are seated sometimes in the fluids, sometimes in the cavities of the brain, or in its vessels; or in the chyle diffused over the system, or in the substance of the brain; or else the temporal muscles may be affected. If the humours are mixed together, they will produce this affection. Whether the exciting intemperament be simple or compound may be learned from the appearance of the excretions. That the loss of memory and of reason springs from cold we readily ascertain; but whether it be accompanied with humidity or dryness, we judge of from the discharges, the habit and temperament of the patient, his mode of life, the season, and the country.
The cure. If the intemperament be cold, we must warm, but if accompanied with humidity, we must also dry; but if with dryness, we must, at the same time, moisten and warm. In like manner, when the intemperament is warm, we must cool; but if dryness also prevail, we must likewise moisten; or if humidity, we must both cool and dry. Where we find a sanguineous humour prevailing, we must bleed or use acrid clysters, then give hiera, and use masticatories; anoint the head, by mixing with oil things of a cooling and desiccative nature, we mean roses, myrtles, lentisk, and the like; and we must attend to the general system. But, if it proceed from an over-heat and fatigue, we must apply to the head the embrocation of vinegar and rose-oil; and otherwise use a cooling and moistening regimen in all respects, and with regard to food and drink. If carus supervene upon fatuity or oblivion, it also is to be attended to as formerly mentioned under the head of lethargy, where we also stated the discrimination between these complaints.
Commentary. See most of the authors on lethargy and catalepsy.
Nonnus says that carus resembles apoplexy, only that in the latter disease the posterior ventricle of the brain is more especially loaded with serum, whereas in carus the anterior is affected. It differs also, he says, from lethargy, in this respect, that fever precedes carus, but is subsequent to an attack of lethargy. Carus, he adds, is occasioned by a blow, pain of the head, and fracture of the bone compressing the brain. Alexander also says that, in carus, the anterior part of the brain is most affected; and hence the sensorial powers are much impaired. It is occasioned, he says, by violent pains which dissipate the vital spirits. On the cure of loss of memory, see Galen (de Loc. Affect. iii, 5.)
Avicenna has treated at great length of the subjects of this Section. Among other things he recommends the celebrated theriac, which contained a very diffusible stimulant oil. His treatment otherwise resembles our author’s. The same may be said of Haly Abbas. For loss of memory, Alsaharavius recommends the application of fragrant and stimulant oils to the head, along with general treatment.
Cælius Aurelianus and Octavius have not treated of carus by name; but, according to Prosper Alpinus, the Methodists entertained similar opinions of the disease to the other sects. (De Med. Meth. x, 5.)
Procopius states that carus was a common symptom of the fatal plague which prevailed in the reign of Justinian. (Persic. ii.)
The philosophers, as well as the physicians, taught that loss of memory is often connected with disease of the posterior portion of the brain. See, in particular, the Commentary of Philoponus on Aristotle (de Anima, i.)