108 NATURAL HISTORY CALENDAR. 
Pickeringii Le Conte) will be out in abundance, and about the 10th or 
sth their eggs may be found attached singly to the floating vege- 
tation; never in strings or masses, as is the case with all our other 
toads. and frogs. In about twelve days the young are hatched, and 
are much further advanced in the tadpole state, than in our other 
species of frogs and toads, which do not have distinct tails, well 
marked heads, and the power of free locomotion for several days 
after they are hatched, and therefore remain during that period in 
the gelatinous mass surrounding the eggs; but the eggs of the Little 
Tree Toad not being provided with this reiii substance, a 
young are forced to swim about in search o , aS soon as 
leave them, and are, therefore, more perfectly waive to their saloi 
of ‘‘fish-life” from the firs 
The peculiar half-grunts, hatching of the Wood Frogs (Rana sylvat- 
ica Le Conte) are first heard, generally, about the middle of the month 
in ponds or even temporary pools of water. In a few days their eggs 
are laid in masses about three inches in diameter, attached to spears 
of grass, and they leave the water for their summer abode in the 
damp and shady woods. The eggs are onlin in esi six days, 
and the cies rapidly developing, attain the form of adults by 
mporary ; 
the time the 
_ The Casia Toads (Bufo iieii Le Conte) usually appear 
from the 15th to the 20th of April, when their peculiar low trilling 
notes are heard in every direction for a month or two afterwards. 
Their eggs are laid in long double strings, from about the 20th of 
April to the middle of May, and often even as late as June, owing, — 
probably, to the great ‘distance many of the Toads have to travel in 
order to reach the water. The tadpoles cham ty hatched peee 
days after the eggs are laid. 
The Spade-footed Toads (Scaphiopus Holorookit Baird) are more 
tmeerthin in their appearance, being governed entirely by the dampness 
ordryness of the season, and are only found in isolated localities. Often 
appearing by the middle of this month, they may not, "e a following 
oe come forth until a long summer’s rain has mad 
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