i~ticl<3' substance, so sujiposc v:o seat! or some fine road dust over them 

 and see what will happen. H 3'ou do this snecesslnlly you will close 

 up all their breathing holes, and thus choke them to death. 



But how about those rose bushes with their leaves stripped of theii' 

 clilorophjll? Can you find any worms on them? If so, how do they 

 compare with the others? Yes, they resemble the others in most re- 

 s]iects, but they are not covered with a sticky substance. 



A'ow", how do we know that these three insects all belong to the 

 Saw-Fly family? If wc could examine the female flies of each kind 

 we -ivould always find the little saw of which I have spoken tucked 

 away ready for use. But that is too difficult a task. I think it will be 

 easier for you to find out about the family by examining the young 

 of these flies, or the larva'; that is, those wornn of which we have been 

 talking. 



Suppose 3'ou find a tent-caterpillar and count its feet. Sixteen, you 

 say? That is correct. And the strange thing is that there is but one 

 h'mily among the insects that has more than sixteen feet; and that is 

 the Saw-Fly family. Now count the feet of each of the three worms 

 rf which we have been talking. How many do you find? Twenty in 

 each case, you say. Very ^^■ell. Here you have the family of which I 

 spoke. 



III. 



At some cinivimient time visit the celery plants gro^'ing in the gar- 

 den and see what you ^lill find. I think it will be a peculiar striped 

 worm, eating away at the plants. You have all seen him before, but 

 w^ho knows what liceonies of him ? X'isit the spot again in a few days 

 and see what ynu find — a fjright-colored olijcct liung up by one end 

 I0 a celery stalk, and around ils shouldeis it has placed a silken thread 

 or Itnnd and fa-lcucd tlie I'uil-; to the celeiy plant also. Yow, in order 

 l<> be sujv of it when it nial.c< it- nexl cluinge. Vdii had better take 

 the stalk 1n which it is attaciied and place it in your fireedino- cao-e. 

 If you walcli it carefully ynu Mill dliserve anotlier verv curious 

 rcRult. It will ha\e beautiful wings, and I wi-^h jwi to take your 

 books and mal;e notes of tlieir size, shape, and color, so that you will 

 recognize otiiers of the same kind. 



This is also a good time to visit the cabbage and watch the small 

 white butterflies as they fly from one plant to another, apparently just 

 for the fun of the thing. Yotice what the female is doing. Did you 

 see her lay Inn- egg? Where did she put it, upon the upper or lower 

 side of ihe leaf? Now, nolo carefully wlien the I'ggs batch, and how 



