&5 2 Journal of Agricultural Research vol. xx, No. n 



Experiment 19 (box d), 168 minutes. — Rat 1 was killed on August 7; 

 intestine negative. Rat 2 was killed on August 20; intestine negative 

 and diaphragm negative. Rat 3 died on September 5 ; diaphragm nega- 

 tive. Rats 4 and 5 were killed on September 10; diaphragms negative. 



Results of experiments of series IV. — The X-ray dosages used in 

 these experiments were clearly injurious to the trichinae. The smallest 

 dosage used (experiment 16) had some effect, though it did not destroy 

 the reproductive functions of all the parasites. In the three other experi- 

 ments in which considerably larger dosages were used only 1 infection 

 occurred among the 15 experimental animals on which the infectiousness 

 of the meat was tested, and that infection was slight. 



SERIES v 



This series included six experiments. The dosages used in these experi- 

 ments were not indicated, except that two samples were given similar 

 dosages and that the remaining samples received graded dosages. 

 Furthermore, the samples were mixed so that it is not known which sam- 

 ples received the larger or the smaller dosages. The samples were treated 

 on March 24. Experimental rats were fed in Washington on March 27. 



Experiment 20. — Rat 1 died on April 5 ; no trichinae were found in the 

 intestines. Rat 2 was killed on April 9; intestines contained live tri- 

 chinae; female trichinae contained many embryos; diaphragm negative. 

 Rat 3 was killed April 16; intestines positive; diaphragm positive. Rat 4 

 was killed on April 24; diaphragm heavily infested. 



Experiment 2 1 . — Rat 1 was killed on April 9; intestines contained live 

 trichinae, normal in appearance; female trichinae contained eggs and em- 

 bryos. Rat 2 was killed on April 16; intestines contained many live 

 trichinae. Rat 3 died on April 24; diaphragm heavily infested. 



Experiment 22. — Rat 1 was killed on April 8; intestines negative; 

 diaphragm negative. Rat 2 was killed on April 16; diaphragm negative. 

 Rat 3 died on April 17; diaphragm negative. Rat 4 died on April 24; 

 diaphragm heavily infested. 



Experiment 23. — Rat 1 was killed on April 9; live trichinae were 

 found in the intestines; sex cells were atrophied; no larvae were found 

 in the diaphragm. Rat 2 was killed on April 16; no trichinae were found 

 in the intestines; diaphragm negative. Rat 3 was killed on April 23; 

 diaphragm negative. Rat 4 was killed on April 23; one encysted larva 

 was found in the diaphragm. 



Experiment 24. — Rat 1 was killed on April 2; intestines contained 

 numerous live and apparently normal trichinae. Rat 2 was killed on 

 April 8; live trichinae were found in the intestines; diaphragm negative. 

 Rat 3 was killed on April 16; intestines contained trichinae, apparently 

 dead; diaphragm negative. Rat 4 was killed on April 24; diaphragm 

 heavily infested. Rat 5 was killed on April 24; diaphragm negative. 



