538 PRACTICE OF PHYSIC. 



to be mistaken than with respect to the days. We are in danger 

 here of mistaking the eighth day for the seventh : thus, if the 

 disease appears upon the Monday, the seventh is the Sunday ; 

 but if it attacks on the Monday evening, the next attack will 

 not be till the Sunday evening ; and this may be so obscure as 

 not to be noticed till the eighth day. 



" Erratica vaga. I could find but few instances with respect to 

 the fact, and they are so rare that we would not allow them to dis- 

 turb any tolerable system. The probability is, that they will be 

 always found within the tertian periods. 



" I proceed to the QUOTIDIAN fevers. Here I might first enter 

 into the question, whether there is such a thing as a proper quo- 

 tidian existing ? This seems to be agreed upon, that, whenever 

 repeated paroxysms are alike with respect to the time of their 

 attack and other circumstances, they are considered as forming 

 a particular genus or species of fever ; but when the repetitions 

 are alternately alike only, they are considered as not a distinct 

 species, but an anomaly or irregularity of some of the other 

 kinds, and are distinguished by the name of duplicata, duplex, 

 &c. ; wherefore, as the similarity of fits recurring every day is 

 sufficient for forming a genus, we say, that although we allow the 

 genuine quotidian to be very rare, still there is such a fever, es- 

 pecially in those countries where intermittents are more fre- 

 quently epidemic. As I am not clear, however, that such a 

 distinction leads to any difference in practice, I am not so soli- 

 citous about it. 



" I divide Quotidians into the intermittent and remittent. 



" 1. The Intermittent I subdivide into the'solitarice and co- 

 mitatce, employing the terms of Torti. The solitariae are with- 

 out any unusual symptoms ; the comitatae with some unusual 

 symptoms. Instead of subdividing the comitatae I have thrown 

 all the species together. 



" With regard to the Solitaria, a curious subdivision is that into 

 universal and partial ; according as the fever occupies very evi- 

 dently the whole system, or appears only in one part of the body, 

 or at least is remarkably different in degree in one place from 

 what it is in other parts. 



" To the Universal I have added a little character, which, when 



