46 USEFUL BIRDS. 
food. They were designated by number. On August 20 
No. 1 weighed seventeen ounces and No. 2 fourteen ounces. 
That day the two birds had two ounces of tomato, five ounces 
of sweet corn, fifty grasshoppers (about three-fourths of an 
ounce), —in all, nearly eight ounces, —and they also had free 
access to some grain in the yard. As their weight remained 
the same, they were fed the next day one-half ounce of 
tomato, one ounce of corn, one ounce of muskmelon, five 
ounces of meat, one ounce of beets, and fifty grasshoppers, 
—in all, fully nine ounces. An apple also was eaten to 
some extent, and there was still some grain in the yard. 
Nevertheless, each bird lost about an ounce in weight that 
day. 
They were fed at about the same rate the following day, 
and, as they were losing weight, they were ‘given on the 
23d two ounces of melon, all the grasshoppers that could be 
collected near their place of confinement, four frogs, a sala- 
mander, two ounces of tomato, and five ounces of corn. On 
this diet the Crows regained some of the weight they had 
lost, weighing the next morning sixteen and one-half and 
thirteen and oné-half ounces respectively. On the 24th they 
were fed more than twelve ounces, and the larger bird lost 
half an ounce and the smaller gained about the same weight. 
On the 25th they received over seventeen ounces of food, 
the smaller bird gaining another half ounce and the larger 
bird remaining the same. No. 1 now weighed sixteen ounces 
and No. 2 fourteen and one-half ounces. The next day, 
with twelve ounces of food, the smaller bird lost one-half 
ounce and the larger bird made no gain. Evidently where 
any gain was made by one bird on this amount of food the 
bird either got more than its share, or found some food in 
the yard. 
On August 28 nearly twenty-seven ounces of food were 
given. This was all vegetal matter except thirty grass- 
hoppers (one-third of an ounce). Jé was all eaten, and 
apparently all needed, for neither bird increased in weight, 
No. 1 losing half an ounce. It seemed evident throughout 
the experiment that the birds required much animal food, 
and when vegetal food alone was given, a larger amount 
