61 
more cases of cystic degeneration after an infection with this 
disease. 
Zschokke and Hess consider heredity also to be one of 
the major causes. 
Metritis, however, is a simple and satisfactory explana- 
tion of all the cases of cystic degeneration, which sometimes 
appear to be so erratic. It explains the single and the 
accumulated cases, the cases in slovenly and in well kept 
herds, the cases in the stable and in the pasture. It also 
explains why the disease has a predilection for some loca- 
tions, and why it is sometimes so unresponsive to treatment. 
What other explanation is there for the fact that this ail- 
ment per se so innocent, inclines so often to relapses, if there 
is not another cause, of a much more obstinate persistence 
and duration? 
The successful treatment of metritis indicates also the 
importance the latter has as a cause of cystic degeneration. 
In the years 1905-1906 I treated 127 cows with nympho- 
mania; 67 of them (which equals 56%) became pregnant 
again; of the rest more than half became quiet, and only 
a few animals had to be eliminated on account of their con- 
dition. Among these animals there were, however, a num- 
ber of old cases which gave so little milk that the treat- 
ment did not pay. In the years 1906-1907, the second 
year of the treatment, the number of diseased animals was 
in the decrease. Of 700 cows which were then examined 
I found 61 with cysts, of which 46, or 75%, became preg- 
nant; the rest was cured with only a few exceptions. 
The following tabulation gives a good idea of the suc- 
cess of the treatment; all these herds were under continu- 
ous observation. 
