10 
E. ZSCHOKKE. 
many hundreds of samples of the milk of animals purposely in¬ 
oculated, are embodied in the following table: 
Curable 
Incurable 
Not 
mammitis. 
mammitis. 
infected. 
Total. 
1894 
11=45.8 per ct. 3 = 12.5 per ct. 
10=41.6 per ct. 24 
1895 
10=50 
“ 3 — T 5 
u 
7 — 35 
u 
20 
1896 
111=56.6 
“ 23=11.7 
u 
62=31.6 
u 
196 
1897 
132=49.6 
“ 50=^18.7 
U 
84 = 3 i -5 
u 
266 
I898 
126=40.9 
“ 65=21.1 
u 
I][ 7 = 37 * 9 
u 
308 
1899 
I 79 = 50-6 
“ 42=11.8 
u 
i 33 = 37-6 
u 
354 
Total 
569=48.8 
“ 186=15.9 
u 
4 l 3 = 35-3 
u 
1168 
Tabulated according- to months, 
v_» / 
the samples sent in during 
the years 1896-1899 give the following averages : 
Curable. 
Incurable 
No 
mammitis. 
mammitis. 
infection. 
Total. 
* 
* 
* 
* 
Jan. 
4.6 14 
i -3 4 
5-3 
l6 
II -3 
34 
Feb. 
7- 21 
2.6 8 
7-3 
22 
i 7 - 
5 1 
March 
12 .3 14 
4-3 !3 
6 -3 
!9 
23 
69 
April 
II 44 
3-5 14 
9 
3 6 
23-5 
74 
May 
14-2 57 
5.2 21 
11 
44 
3°-5 
122 
June 
16.7 67 
4.7 19 
8.2 
33 
29.7 
119 
July 
18.2 73 
5.0 20 
i 4-5 
53 
33-5 
146 
Aug. 
15.2 62 
4.7 19 
9-5 
73 
29.7 
119 
Sept. 
12.9 48 
4.2 17 
10.0 
40 
26.2 
105 
Oct. 
13-5 54 
4 16 
10.2 
4 i 
27.7 
hi 
Nov. 
8-5 34 
4.5 18 
9.0 
36 
22.0 
88 
Dec. 
9-2 37 
2.7 11 
4-5 
18 
16.2 
66 
The figures in the columns under the star show the total 
number of samples sent in during each month of the four years. 
The figures opposite them show the average number per month 
for that period. 
It is to be noted that the figures for the year 1896 begin 
with the month of April, for the law authorizing federal inves¬ 
tigation of infectious mammitis in the Canton of Zurich first 
went into effect in April, 1896. 
It appears from the foregoing that infectious mammitis is on 
the increase from year to year, or rather is brought to light in 
greater amount. It is also plain that while the disease is man- 
