of tlie Troops at Kurnaul. 57 



This is proved every year ; the succession of seasons is charac- 

 terized by a different form of fever, and by the prevailing endemic 

 fevers in different climates and localities. 



A reference to these Tables, shews such was the regular course 

 of the periodic diseases which prevail at Kurnaul ; intermittents are 

 common in the early part of the year, and gradually pass into remit- 

 tents during the hot and rainy seasons, and at the end of this season, 

 again, assume their preponderance, which they retain during the 

 continuance of the cold weather. There is not in my opinion in the 

 whole subject of the etiology of disease, a better established fact, than 

 the. connection between marsh malaria and intermittent and remit- 

 tent fevers, in their relation of cause and effect. I hold no modified 

 faith. I acknowledge marsh malaria to be the active agent in the 

 production of these forms of disease. In the doctrine of the cau- 

 sation of these forms of fever, the intermittent and remittent, I 

 believe, that the difference is dependent upon te r perature. That malari- 

 ous exhalations produce, in cold or temperate countries, intermittents ; 

 while the same miasmata would, under an increased temperature, 

 or tropical climate, occasion remittents. Mere latitude, as McCulloch 

 has observed, is not alone a modifying agent ;. diminished temperature 

 in tropical countries, produced by elevation above the earth's surface, 

 will cause a difference in the ^pe of fever. There are unequivocal 

 proofs of their intimate' dependency, as cause and effect, which have 

 been accumulating for two centuries. 



From Table No. 1, we learn that the months of July, August* 

 September, and October, were the most unhealthy and fatal of the 

 year; the ratio per cent, to strength, being respectively for these 

 months, as follows : — 



{July, 13-16 

 September, . . . . . . 20*60 

 October, 14-13 



and the per centage of deaths to strength were : — 



{July, to strength, . . 0-38 



August „ 0-49 



September, „ . . 0'()4 



October, „ .. 0-64 



It is remarkable, that the per centage of admissions and deaths in 

 May was very large ; that of admissions being higher than that of July, 



i 



