. XXXII. 4. DISEASES OF IRRITATION. 427 



It the deficiency of the ftimulus of heat is very 

 great, the quiefcence becomes fo general as to ex- 

 tinguifh life, as in thofe who arc frozen to death. 



If the deficiency of heat be in lefs degree, but 

 yet fo great as in fome meafare to diforder the 

 fyftem, and fhould occur the fucceeding day, it 

 will induce a greater degree of quiefcence than 

 before, from its acting in concurrence with the 

 period of the diurnal circle of actions, explained 

 in Seel:. XXXVf. Hence from a fmali beginning 

 a greater and greater degree of quiefcence may be 

 induced, till a complete fever-fit is formed ; and' 

 which will continue to recur at the periods by 

 which it was produced. See Seel. XVIL 3. 6. 



If the degree of quiefcence occafioned by de- 

 fect of the itimulus of heat be very great, it will 

 recur a fecond time by a (lighter caufe, than that 

 which firft induced it. If the caufe, which induces 

 the fecond fit of quiefcence, recurs the fucceed- 

 ing day, the quotidian fever is produced ; if not till 

 the alternate day, the tertian fever ; and if not till 

 after feventy-two hours from the firft fit of quief- 

 cence, the quartan fever is formed. This laft kind' 

 of fever recurs lefs frequently than the other, as it 

 is a difeafe only of thofe of 'the temperament of 

 affociability, as mentioned in Seet. XXXI. ; for in 

 other conftitutions the capability of forming a habit 

 ceafee, before the new caufe of quiefcence is again 

 applied, if that does not occur fooner than in 

 feventy-two hours 



.And hence thofe fevers, whofe caufe is from cold 

 air of the night or morning, are more liable to 

 obferve the folar day in their periods ; while thofe 

 from other caufes frequently obferve the lunar day 

 in their periods, their paroxyfms returning' near an : 

 hour later every day, as explained in Seel. XXXVI. 



IV. Another frequent caufe of the cold fits of 

 fever is the defect of the ftimulus of diftentioh. 



F f The 



