BULLETIN OF THE BUSSEY INSTITUTION. 279 
putty and oats in order that they might recover from the ill-effects 
of the barium compound, and were then put upon rations of white 
lead, as follows: Three balls of putty made from pure white lead, 
and 7 grms. of oats, were given to the three animals. They ap- 
parently ate a little of the putty; but the material was so sticky 
that it must have been repulsive, and in order to avoid this dif- 
ficulty, enough sulphate of baryta was worked into the balls to 
give them a firm subsistence. They were then replaced in the 
cage, and next morning it could be seen that a small portion of 
one of the balls had been eaten; in fact, one of the rats was found 
dead, and on the day following another of the animals died. It 
was plain that, as had been the case with the mice, the rats were 
readily destroyed by white-lead when there was no whiting present 
to shield the animals from the poisonous action. 
The surviving rat was fed with plain putty for a day or two, 
after which time he received and ate each day for two days a ball 
of putty made from a mixture of equal parts of slaked lime and 
whiting. He was next given a ball of putty made from a mixture 
of 1 part oxide of zinc and 3 parts whiting, together with 24 grms. 
of oats, and although he ate very little of the ball, he died soon 
afterward. 
I was much indebted to my friend, Mr. L. S. Ford, for assist- 
ance in carrying out the details of these experiments. He was a 
student at the Bussey Institution at the time (1877-78) they were 
made. 
July, 1878. 
