Let us see how tlio house fly differs from the mosquito in these re- 

 spects. Do you think the fly lays her ey,<;s in ttie water? Ts'o, she 

 lays her eggs in cracks in the floor or in other out-of-the-way places 

 where there is a good supply of food for her young. Here they live 

 till they are full grown, when they change their form, as did the mos- 

 quito, but they take on a very different shape, looking somewhat like 

 a small black bean. After a short time, one end of this little black 

 case is forced ofE and out comes Wr. Fly. 



I wish you to notice that these insects which we have called our ene- 

 mies are not altogether bad. They help us while they are young by 

 destroying various kinds of filth and decaying matter which, if left in 

 the water, or upon the ground, or in our dwellings, would be very in- 

 jurious to our health. 



I think perhaps we have said enough about the fly and mosquito at 

 this time to put you on the right track, so that during the summer 

 with the aid of your glass you will be able to discoAcr many more in- 

 teresting tilings about them. 



II. 



Spring will soon be here and with the first warm days the currant 

 and gooseberry bushes will begin to send out their leaves and will take 

 up another season's work of increasing their growth and producing a 

 crop of fruit. If those of you who have them in your gardens will 

 watch carefully you will probalily find after a few days, down in the 

 center of the bush, some leaves ^\hich have tiny holes through them, 

 and yet there does not appear to be anything on them. But pick a 

 leaf and look closely at the underside of it. There you will find a 

 dozen or more little greenish worms -Hith black dots all over their 

 bodies. Where could they have come from? Look carefully along 

 the ribs of the leaf on the underside and you will soon be able tn 

 answer this question. 



But in (irdei- to find out what licconies of these worms when they 

 are full grown, we must have a bleeding cage. Such a cage is easily 

 made. You liave only to take a small box, about a foot in diameter 

 each way, knock off the bottom board and replace it with cheese-cloth 

 and then eo^er the top with glass so that you can see what is going 

 on inside. When the worms are about three-fourths of an inch long, 

 which will be when they are about three weeks old, put some fresh 

 currant leaves in the breeding cage and on these place some of the 

 worms. Give them fresh leaves every day as long as they will eat and 

 watch carefully to see what becomes of them. 1 can tell yuu, but I 



