I 
SEDGWICK AND WINSLOW. 
BACILLUS OF TYPHOID FEVEn. 
OJI 
Davidson also attempted to 
■ 
peratiu 
variations fr 
4 
the causal relation between Uuho'ul 
ye 
o 
of the gronnd-water theory 
year after the method a.lopfed 
I 
n 
figures for the period 1877-87, with a 
the case of N( 
mean summer 
•y So}k 
Soulh Wales h 
tempeiafuro (Dcccnil 
February) of 71.14 F., and a mean typhoid death rate of 5.02 per 10,000, and di 
them to form the two following- tables. 
\o 
Six Years with Temperature and Typhoid Rate above the Mean 
FOR THE WUol I Ti I lull. 
1S77. 
Mean Summer Temperature 
Mean Typhoid Death Rate 
71.40 
5.96 
isrjs. 
72.00 
6.70 
1 ss>. 
isst. 
1SS.1. 
IS 
71.17 
5.66 
71.47 
6.86 
Tl 
71.87 
5.10 
7:M0 
6.o:j 
Five Years with Temperature and Typhoid Eate below the Mean for tiii whoi.k l*ji!i..t». 
i8r!». 
Mean Summer Temperature 
Meau Typhoid Death Rate 
71.00 
3.84 
isso. 
18S1. 
1SS3. 
issy. 
70.17 
3.31 
70.03 
> 
70.07 
4.7G 
71.10 
4.24 
j 
Again, in the case of England, Davidson separated from the period 1803-87. four 
liici 
1 \\ <■ I e 
years in which enteric fever was nnusually prevalent, and five years w 
remarkably free from that disease, and tabulated the relative mean temporal un- n>r 
those years as follows : 
Four Years with Maximum Typhoid. 
Tear. 
1865 
1878 
1880 
1884 
Difference between Temperature and 
Meau Temperature, 1SG3-S7. 
For the Year. 
For the Third 
Quarter. 
Five Years with Minimum Tviihoid. 
Tew. 
+ 1.0 
4-0.3 
-fO.l 
+1.4 
+2.1 
+0.4 
+ 1.0 
+2.3 
1867 
1877 
1879 
1881 
1885 
Difference betu t . .» Tcui^raXun and 
Mean Temperature, IM K. 
For the Third 
Quarltr. 
0.7 
+0.1 
3.1 
0.6 
0.7 
-0.7 
1.9 
2.3 
-4).4 
1.3 
These investigations of the yearly variations in typhoid fever are of 
interest and 
uld be 
b 
e 
diffi 
er 
hown by Diivid 
and the material so limited as to nreclude the drawing of any 
The 
the snr 
d most defi 
statement of the effect of temperatii 
pen 
spread of typhoid fever that we have seen was m 
ade by Professor Woodheafi 
m 
testify 
1893 
ng before the Royal C 
on 
Metropol 
^ 
piv 
II 
f the importance of spring floods in carrying Infection 
