BULLETIN OF THE BUSSEY INSTITUTION. set 
from 3 parts oxide of zine and 7 parts whiting were put in the 
cage, but the mouse absolutely refused to eat any portion of either 
of these balls, although pains were taken to make the putty of 
various degrees of consistency, on the different days, by using 
more or less oil in preparing it. In order to break up this habit 
of refusal a quantity of plain whiting-putty was given to the animal 
on the seventh day. He ate a ball of it at once; and on the fol- 
lowing day, when a ball of the mixed oxide of zine and whiting 
(3:7) was offered him, he ate a portion of that also and died the 
day afterward. 
It was noticeable throughout these experiments that the dung of 
the mice that were fed upon zinc compounds was neither of large 
size, like that obtained from the really inert materials, nor was it 
so white as the dung from the other white materials. It was light- 
colored, it is true, but its appearance was wholly unlike that ob- 
tained from whiting and the other materials. There was nothing 
about it to suggest that it consisted of inert matters which had 
simply passed through the animals. On the contrary its appear- 
ance indicated that the zinc compounds must undergo changes in 
the bodies of the animals, such as the other materials were not 
subjected to. 
Slaked Lime. Several balls of putty made from powdery slaked 
lime and oil were offered to a lot of three mice, but only a small 
portion of one of the balls was eaten. Next day three balls made 
from a mixture of equal parts of slaked lime and whiting were 
given. All but half of one of the balls of this mixture was eaten, 
and one of the mice was found dead. The surviving mouse re- 
fused to eat any more of the mixture, and the experiment was 
carried no further. 
Whiting and Syrup. Instead of putty proper, a couple of mice 
were fed for several days with mixtures of whiting and a strong 
solution of sugar made up into balls of the consistence of ordinary 
putty. The mice ate the mixture freely, and their dung seemed 
to be even whiter than any that had been previously observed. 
The cylinders of dung seemed on a cursory examination to be of 
rather smaller size than those from the putty proper, but no pains 
were taken to verify this supposition by actual measurements. 
