﻿74 The Philippine Journal of Science im 



iment was employed. Conditions were changed slightly by 

 covering the carabao wallow on top and on three sides with a 

 grass thatching. The weather was generally dry. Four test 

 animals failed to contract rinderpest when exposed in the corral 

 at intervals of one, three, five, and seven days after the removal 

 of the sick. They were left in the corral for periods varying 

 from one to seven days. 



Expenment 5. — The corral used in experiment 2 was em- 

 ployed, but the weather was uniformly hot and dry. Three 

 susceptible animals were used to test the infectivity of the corral 

 at intervals of one, two, and three days after the removal of 

 the sick, but negative results were obtained. The test animals 

 were left in the corral for intervals of two, three, and four days. 



Experiment 6. — The same corral as in the preceding exper- 

 iment was employed, but some rain fell during the period of the 

 test. Three susceptible animals were exposed at intervals of 

 one, two, and three days after removal of the sick ones, and 

 negative results were obtained. They were left in the corral 

 for periods of five, six, and seven days, respectively. 



Expenment 7. — The same corral was employed as in the two 

 preceding experiments, but the ground was kept constantly 

 moist to simulate wet weather. Three susceptible animals were 

 exposed in the corral at intervals of one, one and one-half, and 

 two days after the removal of the sick animals. They were left 

 in the corral for four, four and one-half, and three days, respec- 

 tively, but negative results were obtained. 



Expenment 8. — The tests were made in the same corral as in 

 the experiments immediately preceding, and the presence of 

 infection at the time the sick were removed was demonstrated 

 by a control animal. This animal became infected some time 

 within twelve hours after the sick animals were removed. Two 

 other susceptible animals failed to contract rinderpest after 

 exposure at thirty-six and forty-eight hours' interval following 

 the removal of the sick. They were left in the corral for forty- 

 eight and twenty-four hours, respectively. 



Experiment 9. — The surroundings of this experiment were 

 similar to those of the preceding ones. One susceptible animal 

 was exposed in the corral at twenty-four hours after a sick one 

 had been removed, and was left there for twenty-four hours, 

 with negative results. 



Experiment 10. — This experiment was similar to the pre- 

 ceding ones with regard to surroundings, but the infectiveness of 

 the corral was tested at intervals of twenty-four hours or less 

 after the removal of the sick animals. One animal exposed 



