334 <S/r Everard Home's account of 
sea, are observed to fly inland towards extensive swamps 
where gnats and other insects are in great abundance. Those 
that build in inland caves, are observed to quit the caves in 
the morning, and generally return in swarms darkening the 
air, towards the close of the day ; they are, however, going in 
and out the whole of the day. This bird is double the size 
of our common swallow. There are two separate nests, one 
for the male to lie and rest in, which is oblong and narrow, 
adapted to his form, the other wide and deeper, to receive the 
female and the eggs. 
As Mr. Bauer has been kind enough to make drawings^ 
of the gastric glands in the blackbird, the common swallow, 
and Java swallow, in which the parts are so much magnified, 
that the difference in their structure is obvious to the most 
superficial observer, it is not necessary in this place to enter 
much into detail respecting them : I shall only observe, that 
from what is represented in the drawings, it is evident that 
the gastric glands in the swallow tribe, both those that mi- 
grate and those that remain during the whole year in Java, 
do not afford the same supply of gastric liquor as in other 
birds, since they have a smaller receptacle belonging to the 
gland into which the secreted liquor is to be received. This 
circumstance confirms the observations that I made, upon a 
former occasion, respecting the gastric glands of the casuary 
of Java and of the ostrich, that these glands are largest in 
those birds that inhabit countries that afford a small supply 
of nourishment. The swallow of Java, as well as the casuary 
of that island, lives in perpetual plenty, and the swallow that 
migrates, although it travels from the equator to the pole, 
only remains in cold countries during the summer season. 
