Nymphomania 195 



them (the third was sold) the ovaries felt normal a few days after 

 parturition and contained no yellow bodies ; four months after 

 parturition both animals showed bilateral cystic degeneration of 

 the ovaries and again well marked nymphomania. 



The length of interval between recurrences is very variable in 

 different individuals and ranges between a minimum of 3 and a 

 maximum of 120 days, between which occur periods of 8, 12, 14, 

 16, 20, 27, 30 and 60 days. Often we find, in heifers and j-oung 

 cows, at the beginning, long and regular intervals ; later short and 

 irregular, or the reverse. So, for example, we observed the : 

 first formation of cysts i ro daj^s after calving, in both ovaries ; 

 second formation of cysts 120 days after calving, in the right 



ovary ; 

 first formation of cysts 60 days post partum, in both ovaries ; 

 second formation of cysts 120 days post partum, in right 



ovary ; and 

 third formation of cysts 160 days post partum, likewise in 



right ovary. 

 One three year old cow which had not yet been pregnant 

 showed cysts in the left ovary three times in succession at 

 intervals of one month each. Three months later, both ovaries 

 had undergone cysto-fibrous degeneration and estrum now re- 

 curred every 8 days. 



In another three year old cow which had not been pregnant, 

 estrum recurred at first every 28 days and lasted 2 days ; later 

 the patient, suffering from recurrent bilateral ovarian cysts, was 

 in estrum every 12 days. 



A 2^ year old heifer, which had not been pregnant, showed 

 at first a small cyst in the left ovary, eight days later a cyst as 

 large as a hazelnut in the same gland, and, further, 15 days later, 

 a cyst in each ovary the size of a large hazlenut. 



When the period elapsing between the recurrence of cysts is 

 comparatively long, there frequently occurs one or two normal 

 estrual periods, the cow appearing in all ways normal but failing 

 to conceive. 



The frequency of recurrence is extremely variable. In 50 % 

 of the cases, after the cysts have been crushed, they do not re- 

 cur until after the next calving. In individual cows, the forma- 

 tion of cysts occurs almost immediately after each calving, and rel- 

 atively such animals very frequently conceive after proper hand- 



