94 NATURE-STUDY REVIEW [12:2— Feb., 1916 



point one-quarter of an inch from the tip. Place handle between wires and 

 drive the bent tips into opposite sides, wind with tire tape or cotton twine, 

 and the net is done. It makes a neater, firmer job, if we cut fine grooves in 

 the handle where the wire shanks fall and press the wires smoothly into them 

 as we wind to handle. 



The name, "Getthelastone fly net," may be printed on the nets before 

 the wires are run in by means of a hectograph pad, or it may be done by running 

 the nets, or the cloth, through a regular printing press. This carries a good 

 suggestion and serves as a timely reminder. It is well to have them printed 

 in colors, if they are to be distributed at a campaign rally, or at fairs or if they 

 are made up for sale in the stores. 



Multiplication of Flies. "And he (Moses) removed the swarms 

 of flies from Pharaoh, and from his servants, and from his people, 

 there remained not one. Exodus VIII, 8i. Allowing ten days to 

 breed a generation, each female laying (one-half the flies are 

 females) 150 eggs every ten days for six batches, and the young 

 flies beginning to lay when ten days old, how many flies might 

 be produced from a pair in three months — May first to August 

 first? Have pupils who are old enough figure this out and 

 compare answers. How do they agree with these figures? 



May 1, we begin with two flies, 2 flies % 



May 10, we have 152 flies 



June 10, we have 34>3° 2 flies (or 4 quarts) 



July 10, we have • 72,280,800 flies (150 bushels) 



Aug. 1, we have 5,746,670,50c flies (143,875 bu.) 



Instead of soaking down tons of manure with hellebore water 

 or building maggot traps, or shutting ourselves in jail behind 

 expensive bars of fly screen, why not let this pair catch them- 

 selves May first" With an insect capable of such rapid increase, 

 and since one — in the milk or gravy — is as bad as more, nothing 

 could be more uninteresting than talk about reducing the numbers 

 67 or 76 per cent. We cannot hope to have people take any inter- 

 est or put forth effort unless they can see the possibility of a clean 

 job and definite relief from the pests. 



Plan of Campaign. Is it possible to make a plan good enough 

 to enlist every man, woman and child, or at least, some one person 

 in every household in the community? This is the first thing 

 necessary, because one family, not in the game, can make success 

 impossible for all the rest. Let each member of the class work 

 out in detail the best plan he is able to devise, discuss and compare 

 them all, and finally draw up a workable plan and have it printed 

 in the local papers. The following fall or winter plan to write 

 up this story, tell all about how it succeeded and what changes 

 vou would recommend to make it better for the r.ext season. 



