Mar. i, i 92 i Effects of X-Rays on Trichina? 847 



Experiment i. — Strength of dosage, 2,899 units. 

 Twelve rats and two mice were fed in this experiment. 

 Rats 1,2, and 3 were fed on January 23. Rats 1 and 2 were chloro- 

 formed on January 26. No trichinae were found in the intestines. 

 Rat 3 died on February 23; diaphragm negative. 



Rats 4 to 9, inclusive, were fed on January 25. Rat 4 was killed on 

 January 26. Trichinae were found in the intestine. The parasites 

 were about ready to molt. They were somewhat paler than normal. 

 Rat 5 was killed on January 27. No trichinae were found in the intestine. 

 No. 6 was killed on February 26; diaphragm negative. No. 7 was killed 

 on March 12 ; diaphragm negative. No. 8 and 9 were killed on March 15; 

 diaphragms negative. 



Rats 10 to 12, inclusive, were fed on January 30. Rats 10 and 11 

 were killed on January 31. A few trichinae were found in the intestines 

 of each animal. The parasites showed evidences of growth. Most of 

 them were dead, however, having undergone granular degeneration. 



Rat 12 was killed on February 1. A few trichinae were found attached 

 to the mucosa of the intestine. These showed evidence of growth. 



Two mice were fed some of the treated meat on January 29. Mouse 1 

 was killed on January 30. No trichinae were found in the intestines. 

 Mouse 2 was killed on the same date. A few trichinae were found in the 

 intestines. The parasites were dead but showed evidence of growth. 

 No details of structure were made out because the parasites had under- 

 gone granular degeneration. 



Experiment 2.— Strength of dosage, 966 units. 



Nine rats were fed in this experiment. Rats 1 to 3 were fed on Janu- 

 ary 23. Rat 1 was killed on January 26. No trichinae were found in 

 the intestines. Rat 2 was killed on February 2. A few trichinae, appar- 

 ently fully grown, were found in the intestines. The parasites showed 

 rather striking malformations, which were especially pronounced in the 

 reproductive organs. The gonads were shrunken. The uterus of female 

 specimens contained eggs, but the latter were full of minute granules. 

 The receptaculum seminis, which in normal females is crowded with 

 spermatozoa, was empty. 



Rat 3 was killed on February 6. No trichinae were found in the in- 

 testines. 



Rats 4 to 9 were fed on January 25. Rat 4 was killed on January 27 ; 

 intestines negative. Rat 5 was killed on February 1 ; a few trichinae 

 were found in the intestines. The parasites showed marked evidence of 

 degeneration. The cuticle was wrinkled; internally numerous vacuoles 

 were seen; the sex cells appeared undeveloped; the worms showed very 

 feeble movements. No. 6 was killed on February 26; diaphragm nega- 

 tive. No. 8 and 9 were killed on March 15 ; diaphragms negative. 



