130 THE NATURE STUDY COURSE. 



olive-green ; head black. (10) It is crossed with dotted ridges bearing 

 club-shaped hairs. (11) At the edge. (12) It moves along a silken 

 strip. (13) It returns along its silk to the middle to rest. (14) Nearly 

 the same color as the leaf, making it hard to find. (15) The teacher 

 says that it has grown too large for its skin and that it is going to get 

 out of its old skin ; also that it has a new skin ready. This change is 

 called moulting. (16) The front one is its head-case ; it rubbed it off. 

 The old skin opened down the middle of the back and the larva twisted 

 itself out. (17) Brighter, and the new head-case is green. (18) 3 or 4 

 mm. now. (19) 3 or 4 days. (20) Doubles its length, color is darker 

 and shows a stripe. (23) 15 mm. long, striped on sides. (24) More 

 beautiful than ever; a crimson line on the side stripes ; an inch' long. 

 (26) It has made a mat of silk ; hind feet are tied into a little pad of 

 pink silk ; it is holding to the mat with its front feet. It is spinn'ng a 

 hammock to lie in. It is getting a shell over its bod}-. The teacher 

 says it is a chrysalis now. (27) The color sketch shows an elongated 

 angular object, colored green with yellow stripes. (28) Sixth day it is 

 getting yellow. (29) The case is split open and a beautiful yellow 

 butterfly is coming out. The teacher says this is the Clouded Sulphur 

 butterfly, and that its Latin name is Colias or Eurymus Philodice. 

 After making this water-color of it we let it fly away to be a puddler 

 with the other yellow butterflies. 



Were the class studying this insect from the point of view of 

 science the imago would very properly be put into the cyanide 

 bottle and later be duly pinned, spread and labelled. From 

 the Nature Study view the sympathy called forth by the 

 imagined enjoyment of its liberty is worth more than the 

 manual exercise of spreading and mounting it. 



While the above treatment of the Clouded Sulphur shows 

 how the book or printed help may be used, there is a better 

 way for the teacher to prepare the lesson than from the book, 

 that is, by studying the insect or animal or plant at first hand 

 in his own original way and noting every point that he thinks 

 he can turn into direction or question to guide his pupils in 

 their investigation. In view of this fact a hint to start with 

 is given on the grasshopper, mosquito, and a few other common 

 insects. 



