MANUAL OF NATURE STUDY. 
55 
separate glass jars, pass them around the room for 
the children to examine. What sort of covering 
has the snake? The fish? The frog? Will the 
fish and frog shed their skins as will the snake ? 
The teacher should be able to secure some cast off 
snake skins for examination. Do the scales of the 
fish assist that animal in its movements through the 
water ? Do the scales of the snake help in motion ? 
Which way do the scales slope ? Why not forward 
instead of backward ? Where does a fisherman 
begin to scrape the scales from a fish? Why? 
Could we scrape the scales from a snake in that 
way ? Is the skin of the frog scaly ? Why would 
not scales be an advantage to the frog as well as to 
most fishes? Where do fishes live? Frogs? 
Snakes ? Touch the frog’s eye with anything soft. 
Has it any lids? Of what kind? Touch the 
snake’s eye in the same way. The fish’s eye. 
Why should not these animals as well as frogs and 
turtles have lids to draw over their eyes? Try 
turtles. Why should not the frog and turtle have 
upper lids as well as under lids ? Notice the round, 
smooth spot just back of the eye in the frog. . Do 
you find any such spot on the snake or fish? See 
if you can find such a spot on the grasshopper. 
Look just above where the long leg joins the thorax. 
Frogs and grasshoppers can hear, but that matter 
is still in doubt in regard to snakes and fishes. 
