CLASS II. 1.3.1- OF SENSATION. 185 



of animal matter in fome vicious kind of fermentation. Medi 

 cui Review, Vol. III. p. 17. 



SPECIES. 



I. Febris fe nfttiva inirritata. Sensitive inirritated fever. Ty- 

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

 diate caufe of this difeafe is the increafe of the fenforial power o! 

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

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

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

 tata of the preceding geniis confifts of the febris fenfitiva joined 

 \viththefebrisirritativa of Clafs I. i. i. i. In both which 

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

 Or lefs irritation than the natural quantity ; 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 not fupported, to 

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

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

 the warmth and moifture of their fituation ; thefe fevers have 

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

 to what is only their confequence. 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 fenfitive inirritated, or malignant, fever is alfo frequently 

 produced by the putrid exhalations and ftagnant air in prifons ; 

 but perhaps moft 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; fee Seel;. XXXIII. i. 3. 

 The vibices or bruifes, and petechiae or purples, were believed 

 to be owing to the diffblved (late of the blood by its incipient 

 putrefaction ; but hydroitatical experiments have been made, 

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

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

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

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

 petechiae, and vibices, are owing to the deficient power of abibrp- 

 lion in the terminations of the veins. See Clafs I. 2. I. 5. 



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

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

 ages of it, by the colour of the {kin ; which in the latter is 



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