1052 ALL THE VARIETIES OF FEVER ARE 



1 . That both quartans and tertians change into 

 quotidians, and the latter into the continued form 

 of fever, which assumes the typhoid or inflam- 

 matory type, according to the constitution of the 

 patient, and the more or less depressing tendency 

 of the predisposing causes : 



2. That in cases of intermittent fever, the hot 

 stage is always protracted longer than usual, 

 before passing into the type of more frequent 

 repetition, or the continued form : 



3. That there is a gradation in the malignity 

 of fever, and debility of the patient, from the 

 quartan, which is the mildest of the intermit- 

 tents, and therefore has the longest interval, to 

 the most deadly forms of typhus, yellow fever, 

 and plague : 



4. That in temperate climates, intermittents 



of the animating principle. The most remarkable difference 

 between them is, that in the former, the loss of heat is generally 

 local, superficial, or of short duration ; so that if soon restored 

 by artificial warmth, a speedy recovery may be expected ; whereas 

 in diseases brought on by excessive heat and impure air, the vital 

 properties of the blood are more seriously impaired, than by the 

 sudden or partial abstraction of caloric. But if from exposure to 

 external cold, the function of respiration be permanently dimi- 

 nished, as in pneumonia, bronchitis, laryngitis, or pleurisy, the 

 vital properties of the blood are impaired in the same manner, 

 and often to the same extent, as if produced by malaria, or any 

 other morbific agent. In short, however various the remote and 

 exciting causes may be, the essential symptoms are the same in 

 all diseases, and are owing to a loss or deficient supply of the 

 animating principle. 



