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In order to prevent this, a cone shaped trap, in communication with the interior of the pit itself, is attached to the pit, so that the flies are caught.
Another kind of manure heap useful for the anti-fly campaign, is based on the fact that the larvae of the house fly emigrate before birth particularly at night, moving considerable distances away from the manure heap.
Exploiting this knowledge, the Maryland Agricultural College has made a dung heap designed by A. R. Hutchinson and constructed under his guidance. Instead of placing the manure on the pavement, it is collected on a platform with a grating about 30 centimetres above the ground. This platform measures 3x6 metres ; is made of wood and rests on a cement, floor about 10 centimetres high.
The flies lay their eggs as usual on the manure heap, and the larvae, when they are nearly developed, begin their migrations, trying to abandon the manure, and fall into the water beneath, where they die.
; The mere description of these two most recent kinds of dung heaps shows how far the fly problem is from a satisfactory solution and how necessary is the recommendation to adopt wire netting, which is also proof against other troublesome and harmful insects.
XIII. — Cleanliness of House and Person.
It is not enough to construct a good rural dwelling; it must also be hygienically kept.
Regulations for the maintenance of domestic hygiene and the protection of the organism against contagion must therefore be taught.
Hygienic propaganda in rural centres is apt to be a thankless task, and those who undertake it must arm themselves with a generous soul and an enlightened mind, realising that they may never see the fruit of their labours. The propagandist should be an altruist, accustomed to sow for those who come after him.
As teaching hygiene means inculcating hygienic habits, it will be easily understood that our propaganda cannot reap visible results among adults, whom it is hard to break of their old habits and century old traditions and prejudices.
Oral propaganda, especially if seconded by well chosen films, deeply impresses children, who eagerly look out for an opportunity of applying what they have learnt. In rural centres hygiene often penetrates into families through the medium of the younger generation. The children talk to the grown ups with enthusiasm and conviction, and cheer the last days of the old people.
Rural hygiene, being so behindhand, and oral propaganda so poor in results, I consider good cinematography, liable to interest the rural populations, a necessity in the interest of hygienic progress in the country.