850 Journal of Agricultural Research voi.xx.No. n 



SERIES III 



In this series, which includes 12 experiments, the dosages used had 

 the same relative values as those of the preceding series. The time of 

 exposure and distance from the focal spot in the X-ray treatment of 

 th e various samples of meat in this series of experiments were not given 

 in concrete terms, but in experiments designated by the letter a the meat 

 was placed at twice the distance from the focal spot and held four times 

 as long as in experiments designated by the letter b. 



Two rats were used in each feeding experiment. The rats were fed 

 on May 14. 



Experiment ioa. — Dosage, 674 units. 



Both rats were killed on June 15; diaphragms heavily infested with 

 trichinae. 



Experiment iob. — Dosage, 674 units. 



Rat 1 died on May 29; intestines negative; diaphragm negative. 

 Rat 2 died on June 12; diaphragm negative. 



Experiment iia. — Dosage, 924 units. 



Rat 1 died May 28; intestine negative; diaphragm negative. Rat 2 

 died on June 1 2 ; diaphragm negative. 



Experiment iib. — Dosage, 924 units. 



Both rats killed on June 15; diaphragms heavily infested. 



Experiment 12 a. — Dosage, 1,363 units. 



The rats were killed on June 15; diaphragms negative. 



Experiment 12B. — Dosage, 1,363 units. 



The rats died on June 17; diaphragms negative. 



Experiment 13 a. — Dosage, 2,162 units. 



The rats were killed on June 15; diaphragms negative. 



Experiment 13B. — Dosage, 2,162 units. 



The rats were killed June 15; diaphragms negative. 



Experiment 14 a. — Dosage, 1,081 units. 



Rat 1 dead June 5; one unencysted larva found in diaphragm. Rat 2 

 killed June 1 5 ; diaphragm heavily infested. 



Experiment 14B. — Dosage, 1,081 units. 



Rat 1 dead June 12; diaphragm heavily infested. Rat 2 killed June 

 15; results as in No. 1. 



Experiment 15 a. — Dosage, 3,094 units. 



Rats killed June 15; diaphragms negative. 



Experiment 15B. — Dosage, 3,094 units. 



Rats killed June 1 5 ; diaphragms negative. 



Results op experiments of series III. — In this series of experiments 

 trichinous meat subjected to dosages up to 1,081 units proved to be 

 infective, whereas in experiment 2 (series I) a dosage of 966 units impaired 

 the vitality of the reproductive cells of the parasites. Whether this can 

 be accounted for on the basis of variation of trichinae to the effects of 

 X-rays or whether other factors were involved can not be stated. 



