328 BULLETIN OF THE BUSSEY INSTITUTION. 
and the ground was soft where bare. There was rain on the night 
of February 13, and warm weather continued during the 14th with 
bright sunshine. Much ground was bare on the morning of the 
14th, and on the afternoon of that day two fresh watery droppings 
were found upon the roof, both of w hich contained many fragments 
of cherry-stones. The thaw continued during February 1 5, and 
on the afternoon of that day plenty of broken cherry-stones were 
found in the dung. The same remark is true of collections made 
on the 17th and the 22d. There was snow and sleet on February 
21 so that the ground was pretty thoroughly and evenly covered. 
A small quantity of snow fell on the 22d also. ‘The 23d was cold. 
No dung was found on the roof on the 23d, but twenty-four hours 
afterward a few pieces of dung were collected and they contained 
fragments of cherry-stones. On the morning of February 26 an 
abundance of dung was found, and there were plenty of cherry- 
stones in it. Not much of the recent snow had melted up to this 
time, though there were some bare spots of land as there doubtless 
had been all along. On the 3d of March, after several days of 
thaw and rain, large quantities of Gung were found on the roof and 
very large amounts of broken cherry-stones were contained in it. 
My observations were interrupted by illness until April 6, when 
the roof was again swept clean. Much dung was found, all of it 
highly charged ‘with broken cherry-stones. ‘The month had been 
raw and cold and the season backward, so that erass was only be- 
ginning to show itself in warm sunny places. No dung was found 
on the roof on the 9th, 15th, or 17th of April. On the 22d a pig- 
eon was seen to alight on the roof and remain there a short time, 
and on subsequent inspection one piece of fresh dung was found ; 
it was full of broken cherry-stones. No other dung had been 
dropped on the roof since the clearauce of April 6, nor was any 
ever found subsequently. ‘The roof was examined on the 29th of 
April, the 25th of May, the 14th and 19th of June, the 2d, 6th, 
and 12th of July, the 25th of August and the 20th of September. 
The July and August obser vations are interesting since they were 
made at times after the new crops of cherries had ripened, so that 
their stones were doubtless abundant. It may be remarked that 
the weather was still cold and the season backward at the time 
when the last dung was collected on April 22. It was noticeable 
throughout the winter observations that the quantity of broken 
cherry- stones increased to a marked degree when the ground be- 
came bare, especially when the weather was warm enough to keep 
the surface of the ground from freezing. It was equally noticeable 
that both the amount of dung and the proportion of cherry-stones 
in it decreased whenever the ground was covered with snow and 
was frozen hard. 
At intervals in April, 1882, I examined the gizzards of half a 
dozen or more pigeons that had been bought to be used as food. 
With two exceptions, where the birds had manifestly been pur- 
posely fed with Indian corn, I found nothing but a mass of oat- 
husks admixed with gravel. 
