Class ». i. 3. 1. OF SENSATION. fg 5 



of animal rratfer in fome vicious kindof fermentation. Medio 

 cal Review, Vol. III. p. 17. 



SPECIES. 



I. Febris fenfitiva inirritcta* Senfitive inirritated fever. Ty» 

 phus gravior. Putrid malignant fever. Jail fever. The imme- 

 diate caufe of this difeafe is the increnfe of the fenforial power of 

 fenfation, joined with the decreafe of the fenforial power of ir- 

 ritation 3 that is, it confifts in. the febris fenfitiva joined with the 

 febris inirritativa of Clafs I. 2. I. 1. as the febris fenfitiva irri- 

 tata of the preceding genus confifts of the febris fenfitiva joined 

 with the febris irritativa of Clafs I. 1. 1. 1. In both which 

 the words irritata, and inirritata, are defigned to exprefs more 

 Or lefs irritation than the natural quantity 1 and the fame when 

 applied to fome of the difeafes of this genus. 



This fever is frequently accompanied with topical inflamma- 

 tion, which is liable, if the arterial ftrength is riot fupported, to 

 end in fphacelus ; and as mortified parts, fuch as Houghs of the 

 throat, if they adhere to living parts, foon become putrid from 

 the warmth and inoifture of their fituation 3 thefe fevers have 

 been termed putrid, and have been thought to owe their caufe 

 to what is only their confequerice. In hot climates this fever is 

 frequently induced by the exhalations of ftagnating lakes or 

 marfhes, which abound with animal fubftances ; but which in 

 colder countries produce fevers with debility only, as the quar- 

 tan ague, without inflammation. 



The lenfitive inirritated, or malignant, fever is alfo frequently 

 produced by the putrid exhalations and ftagnant air in prifons 3 

 but perhaps moil frequently by contact or near approach of the 

 perfons who have refided in them. Thefe caufes of malignant 

 fevers contributed to produce, and to fupport for a while, the 

 feptic and antifeptic theory of them 3 fee Seel:. XXXIII. 1.3. 

 The vibices or bruifes- and petechia or purples, were believed 

 to be owing to the diflolved ftate of the blood by its incipient 

 putrefaction ; but hydroftatical experiments have been made, 

 which fhew the fizy blood of the patient in fenfitive irritated or 

 inflammatory fever, with ftrong pulfe, is more fluid, while it is 

 warm, than this uncoagulable blood taken in this fenfitive inir- 

 ritated, or malignant fever 3 from whence it is inferred, that thefe 

 petechias, and vibices, are owing to the deficient power of abforp- 

 tion in the terminations of the veins. See Clafs I. 2. 1. 5. 



This fenfitive inirritated fever, or typhus gravior, is diftin- 

 guifhed from the inirritative fever, or typhus mitior, in the ear- 

 ly ftages of it, by the colour of the fkin 3 which in the latter is 



Vol. II. A a paler 



