[ 3 l 9 1 
every Month; and by dividing the Sum of each 
Month’s mean diurnal Perfpiration, &c. by the Num- 
ber of Days in each Month. The mean diurnal and 
nod urn a 1 Heat by Fahrenheit's Thermometer were 
taken by the fame Method. 
The Deductions from theTable, p. 3 2 3 . infra, I have 
digefted all that I could of them tubularly, that they 
might be as clear and fhort as poffible, and appear 
to me to point out the phyfical Principles, from 
whence we may account for the Production of thefe 
epidemic Difeafes of the different Seafons, which are 
not infectious. For are not thefe the EffeCts of dif- 
ferent Conftitutions of the Air on human Bodies? 
And are not the Increments and Decrements of the 
fenfible and infcnfible Excretions, Regard at the fame 
time being had to the Quantity and Quality of the 
Ingefla , and to the Excrcilc, &c. the only Index of 
the Changes produced in the human Conflitution, 
by the Viciffitudes of the Weather? 
That indeed was the only View I had in going 
thro’ thefe troublefome Experiments with fo great 
Affiduity for one whole Year. The Delign was bene- 
volent, and I am afraid far fuperior to my Capacity, 
cfpccially as I am fituated in a Place where 1 can 
have no immediate Affiftance. 
That I may be furniflied with as many 'Data as 
poffible, 1 propofe to take the fpecific Gravity of 
the Cruor , of the Serum and Crajfamentum of the 
Blood, in different Difeafes, and in their feveral 
Stadia , by a very nice hydroftatic Balance, made by 
Mr. Jackfon. But this indeed is attended with 
greater Difficulties than I was at firft apprifed of; for 
the Experiment requires a greater Quantity of Blood 
S f than 
