oe 
Le 
a 
* 
ry 
1899-1900.] Notes on the Frog. IOI 
all hiding. I next got very small worms, which I cut in 
pieces about the size of a pin-head: these I let slip down the 
side of the basin. Soon after, one of the tadpoles happened 
to rest upon the place where the worms slid down, and got 
very excited. Then two or three more came along, and also 
got infected, keeping up the side of the basin to the surface of 
the water, as if in search of the worms. It gave me the 
impression that they smelt where the worm had passed. In 
a short time each tadpole got a small bit of worm, and lay and 
sucked at it for an hour, or an hour and a half, before it dis- 
appeared. <A few of them attacked a second bit, but as a rule 
some pieces were still lying the next day, and the tadpoles 
quietly feeding on the alge on the side of the basin, though 
they never failed to eat all the worm. After this I gave them 
one or two worms cut in small bits every alternate day. It 
seemed necessary that they should be thus cut: a whole worm 
killed and put in lay for a week untouched, when it began to 
develop fungus. I am sure that the whole twelve tadpoles in 
twelve days did not eat the bulk of one of themselves in worms. 
Of course they ate lots of vegetable substances, and I have no 
doubt other small organisms, yet they did not seem ravenous 
feeders, as one would expect of creatures that are accused of 
devouring each other. 
The tadpoles now grew in size at a great rate, and were a 
source of much pleasure and interest to me. About the 
beginning of the last week in May I first noticed two small 
warty-looking growths appear upon one, and one upon another, 
and next day there were one or two more showing like pro- 
_ tuberances, while the tadpole which had only one protuber- 
ance the day before had two now, and very much lengthened. 
I need scarcely say these were the hind limbs. One of them. 
had its hind legs and feet perfectly formed, although not fully 
developed, in five weeks after it was hatched, but it was quite 
eight weeks before the last one was provided with these limbs. 
Some of them now began to show the fore limbs, and these 
were even more erratic in coming than the hind ones. Some- 
times one limb would shoot out in a few hours, showing joints, 
toes, &c., but would remain undeveloped from eight to ten 
days: in fact, there seems to be no rule for the period these 
limbs require to develop, but from the time the first tadpole 
