BULLETIN OF THE BUSSEY INSTITUTION. 327 
succeeded the snow until January 5, when the roof was again ex- 
amined. Of the dung then collected comparatively few pieces were 
found to contain broken cherry-stones. On January 16 the roof 
was cleared again, the dung at that time containing an abundance 
of the cherry-stone chips. Next day there was a snow-fall heavy 
enough to cover almost everything, and a short spell of cold weather 
succeeded the snow. But the collections of dung made on the 19th, 
21st, and 22d showed plenty of the cherry- -stone chips, though the 
chips were somewhat less abundant than they had been before the 
snow. ‘There were at this time considerable fluctuations of tem- 
perature, though the weather was on the whole cold. Enough 
snow melted each day at noon to leave some spots of land bare, 
though the ground froze very hard every night. It was noticeable 
during this time when the ground was nearly covered with snow 
that the separate pieces of dung were more voluminous, softer, and 
darker colored than they had been previously, as if the birds were 
now eating some berry or fruit; but I was unable to make out 
what this new kind of food was. 
On January 22 a cold wind arose, and high winds persisted dur- 
ing the 23d and 24th with intense cold, Fahrenheit’s thermometer 
ranging from 0° to 13° below zero. On the 25th of January the 
thermometer rose somewhat and the 26th was a warm day. Rain 
fell on the night of the 25th and froze firmly on the cold ground. 
But in spite of all this the dung collected on January 26 was all 
charged with broken cherry-stones. During the night of January 
31, nine inches of snow fell; but it drifted badly, so that there were 
some bare spots left around houses and walls, much ground having 
been bare before the storm setin. Many broken cherry-stones were 
found in the dung that was swept off the roof on the morning of 
February 1." No dung was dropped on the roof during February 1, 
but on the 2d of February. and on the 3d also, collections of dung 
were made which contained an abundance of the broken stones. 
There was a small flurry of snow on the 2d which was badly drifted 
by a cold wind on the 3d. February 4 was a very cold day and 
the pigeons manifestly spent but little time on the roof. <A few 
pieces of dung were nevertheless found there in the afternoon, 
and they contained plenty of broken cherry-stones. On the after- 
noon of February 4 snow began to fall and continued until noon of 
February 5. Some 134 inches fell, which being added to that 
already on the ground made a very complete covering. The 
weather was very cold withal, but as the wind was high it is not 
impossible that some bare spots of ground may have been left. 
Not much dung was found on the roof on the morning of February 
6, but some of it contained fragments of cherry-stones. No exain- 
ination was made on the 7th. On the morning of February 8 there 
was only a small quantity of dung found on the roof, and it was of 
very different appearance from that ordinarily observed there, but 
it still contained some fragments of cherry-stones. No dung was 
dropped on the roof during February 9, 10, 11, 12, or 13, although 
a thaw had set in and many spots of land were bare by the 13th 
