in the intestine of the tadpole. 303 
on each side nearly separating the head from the body. On 
■ ■ ~ ■ - • - l ■ . ■ 
the 23d, the ten filaments on each side were distinct; on the 
27th they disappeared. In June, the external orifice on the 
left side, for the water to pass off from the gills, was very 
distinct, but none was seen on the right. On July the 8th, 
the bind legs began to appear, but the toes were not separated. 
On the 14th of July, the hind legs were seen externally com- 
pletely formed, and on opening the skin of the chest, the fore 
legs were equally so; but there was no external projection 
by which this could be known. The lungs were com- 
pletely formed. On removing the intestine, there was no 
fat deposited on the loins. On the 16th, the contents of 
• v - • - w? §. A J JlO ■! /? vv" C J; ,|Q -.iJ-.J J[ j[ |OT[Cf 3lJ .f j[^ A.-O JS V I J, 
the intestine were voided in considerable quantity. On the 
18th, the elbows of the fore legs projected under the external 
skin, and so much of the contents of the intestine had been 
voided as to give a taper form to the lower part of the body. 
On the 19th, the fore legs were completely disengaged and 
appeared externally ; the mouth had become wide like that of 
a frog. The tail had a notch at that part where it after- 
wards separates; the intestine was reduced in diameter, and to 
the length of that of a frog ; an appearance of oil was seen 
on the loins. On the 23d, the tail had dropped off, leaving the 
projecting root. The animal had left the water and remained 
among the grass. Behind the intestines upon the loins were 
several small membranous appendages in an empty state. 
On the 28th, the root of the tail had wholly disappeared ; 
the appendages had become more opaque. 
The ova of the frog appear to be hatched at very differept 
periods, since some of the tadpoles become complete frogs, 
before others have their hindlegs protruded though thd skin. 
. . - - nn vmqrno • a 
Upon examining the tadpole of the rana paradoxa, just 
