§04» Sir Everard Home on the formation of fat 
when the hind feet appear externally, I found the mouth very 
small, and nearly round, the teeth cuticular, the upper ones 
overlapping the under, the oesophagus, stomach, and intestine, 
forming one uniformly continued canal, which passed down to 
the lower part of the abdomen ; it was bent upon itself, passed 
up again, and then made a great number of coils in a circular 
form ; its coats were very firm, its capacity very small. There 
were three gills completely enclosed on each side, and a little 
way below the eye on the left side, a small round orifice, for 
the water, by which the gills are supplied, to pass out; but 
none on the right. When the tadpole is arrived at its full 
growth, and the hind legs are completely formed, which 
takes place, according to Mr. Ireland’s observations, in 14, 
days after their first appearance, the cavity of the abdomen 
had become exceedingly enlarged, the intestine very capa- 
cious, its coats almost as thin as cobweb : it was completely 
distended, through its whole extent, with a soft substance, 
which when burnt had the smell of hay. Behind the intes- 
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tine, all along the posterior part of the abdomen, a large 
quantity of fat was met with of a yellow colour, enclosed in 
long, thin, transparent membranous bags ; no part of this fat 
was met with in the prior stages of the tadpole’s growth, 
The lungs were completely formed. 
When the mouth of the tadpole has been changed into that 
of the frog, and the fore legs completely protruded, but the tail 
remaining entire, which happens 21 days after the last men- 
tioned change, the large coils of intestine were found con- 
tracted into a canal one fourth of its original length ; the coats 
had become as firm as those of an artery, the external surface 
was corrugated and the canal empty. The stomach had be- 
come a distinct cavity, and there was a contraction, where it 
