Oct. io, 1913 
Cysiicercus Ovis 
21 
resembled C. tenuicollis , but in other respects the two forms did not 
agree. Accordingly an experiment was undertaken to determine whether 
the parasites would develop in dogs and whether the tapeworms, if any 
developed, would prove to be T. hydatigena (the tapeworm corresponding 
to C. tenuicollis; also known as T. marginata , the marginate tapeworm 
of the dog), as affirmed by Chatin (1886a), who stated that he had 
obtained T. marginata by feeding mutton cysticerci to dogs, or whether 
they would prove to be some other species. Seven dogs were under 
observation in 1912. Five of these were fed cysticerci from sheep 
muscle, while two, as controls, were fed C. tenuicollis from the omentum 
or mesenteries of sheep. With three exceptions, as noted below in the 
records of the experiment, the dogs were given a dose of castor oil and 
the feces examined for the presence of parasite eggs before the cysticerci 
were fed. During the experiment the dogs were nourished on dog bis¬ 
cuits, corn-meal mush, and some cooked meat but no mutton and were 
confined in separate kennels. 
Dog No. 1.—A grayish brown young female. Fed muscle cysticerci from sheep. 
Feces were not examined before feeding cysts. 
March 25. Fed 1 cyst from heart muscle of sheep. 
March 27. Fed 1 cyst from heart muscle of sheep—probably dead. 
March 28. Fed 3 cysts from heart muscle of sheep. 
March 29. Fed 3 cysts from heart muscle of sheep. 
March 30. Fed 3 cysts from heart muscle of sheep—1 probably dead. 
April 1. Fed 1 cyst from diaphragm of sheep—probably dead. 
April 2. Fed 1 cyst from body muscle of sheep. 
April 3. Fed 2 cysts from heart muscle of sheep. 
April 24. Fed 1 cyst from heart muscle of sheep. 
April 29. Fed 2 cysts from heart muscle of sheep. 
May 2. Fed 1 cyst from heart muscle of sheep. 
May 21. Fed 1 cyst from heart muscle of sheep. 
May 22. Fed 1 cyst from heart muscle of sheep. 
May 24. Fed 2 cysts from heart muscle of sheep. 
Total. . 23 cysts. 
June 22. Eggs of Toxascaris and a tapeworm segment found. 
June 27. Tapeworm segments found in feces. 
July 24. Chloroformed. About 25 individuals of Toxascaris in upper half of 
jejunum. Seven tapeworms, all with gravid segments, in ileum. Heads attached 
near upper end of ileum, about 65 cm. from ileocecal valve. Length of tapeworms, 
45 to 55 cm. 
Dog No. 2.—A white-and-tan young female. Fed Cysiicercus tenuicollis from peri¬ 
toneum of sheep. Feces were not examined before feeding cysts. 
May 10. Fed 1 cyst. 
May 28. Fed 5 cysts. 
Total.. 21 cysts. 
April 5. Fed 3 cysts. 
April 9. Fed 4 cysts. 
April 11. Fed 1 cyst. 
April 18. Fed 7 cysts. 
June 22. Eggs of tapeworm and Toxascaris eggs found. 
July 11. Two tapeworm segments found in feces. 
July 26. Chloroformed. Numerous individuals of Toxascaris in jejunum and duo¬ 
denum. Nine tapeworms with gravid segments; one of the tapeworms was about 
no cm. long. The tapeworms were attached about 8 cm. below the pylorus, 80 cm. 
