Dr. Watt en the Laws of Mortality at Different Ages. 196 



The total amount of deaths in each of these towns was very differ- 

 ent, and yet it will be observed that the proportions of deaths at the 

 different ages to the whole deaths by measles, are very nearly the same 

 in each of these towns ; the variation being chiefly at ages under two 

 years. 



SCARLET FEVER. 



The following table exhibits the per centage proportionate amount 

 of deaths by scarlet fever at different ages in various towns, to the 

 whole deaths by that disease in each town respectively : — 



Under two years, . 



Do. five years, . 



Do. twenty years, 

 Above twenty years, 



Similar examples to the above are given for other towns of Eng- 

 land and Scotland in the Vol. of the British Association Transactions 

 for 1842. The same law is applicable in all the localities examined. 

 That the proportions of deaths by scarlet fever at the different ages 

 to the whole deaths should be so nearly the same in New York and 

 Philadelphia is remarkable ; and although the amount for the lower 

 ages differs from Glasgow, there is no doubt suflGlcient reasons for this 

 variation. 



SMALL-PCX. 



In this table we have compared the proportionate amount of deaths 

 by small-pox per cent, at different ages in various towns, to the whole 

 deaths by that disease in each town respectively : — 



GlM. Edln. N. York. Philad 



Under two years, . . 57-76 63-24 3411 34-39 



Do. five years, . . 8572 82 68 5866 57*14 



Do. twenty years, . 95-12 9523 7274 77-24 



Above twenty years, . 4-87 4-76 27*25 22-75 



From this table it appears that the proportion of deaths by small- 

 pox to the whole amount of deaths by that disease in New York and 

 Philadelphia, at the same ages, is very different from the proportion 

 of deaths by the same disease in the towns of this country ; the propor- 

 tions under two years of age being above twenty-three per cent, less in 

 New York and Philadelphia than in Glasgow. There is, of course, a 

 corresponding increase in the proportion of deaths at the higher ages ; 

 yet it must be observed that the proportion of deaths by this disease 

 at the early ages is the same in Philadelphia as it is at New York — 



