There is another fly in our houses, in small numbers, 
often thought to be the house-fly, but is not. It is best 
recognized in the fall, when a fungous disease attacks it, 
causing it to die on walls and window panes, with the abdo¬ 
men much swollen and white. It should be remembered, 
however, that the house-fly is also attacked by this fungus, 
and many are killed by it. 
There is another fly, much smaller than the house-fly, 
which many people think is a young fly. We must remem¬ 
ber that flies do not grow in size ; they are as large when 
they come from the maggot as they are when they die, and 
the small fly is therefore a different insect, that may be called 
the small house-fly. 
There are so many kinds of flies that it is very difficult 
to identify some of them, for they resemble each other 
closely. We can study some of the other kinds at another 
time, such as the blow-flies, bot-flies, and horse-flies. It is 
believed that there are in America about 10,000 different 
kinds of two-winged flies 
Lessons on the following subjects will be sent to teachers 
as they are prepared to receive them :— 
2. The Honey-bee. 6. Green Plant Lice. 
3. The Cabbage Butterfly. 7. The Potato Beetle. 
4. The Clothes Moth. 8. The Squash Bug. 
5. The Spider. 9. The Tomato Worm. 
SUGGESTIONS TO THE TEACHER 
By all means have some flies under tumblers ; have also 
some sweetened water to feed them. 
If other flies than the house-fly can be displayed, it is all 
the better, but direct special attention to the subject only. 
Watch the movement of the proboscis as the fly laps its 
food. 
Watch the order of lifting the feet as the fly travels. 
Point out the exact color of each part of the fly. 
State clearly to the children that flies lay eggs in decay¬ 
ing matter and that white worms (maggots) hatch from them ; 
then later, winged flies are developed. 
4 
