TCD MS 10515 folio 89 verso
discover the presence of these hidden insects and which would draw them inward to devour them. And this sense must be extremely keen as by it they can distinguish, at no comparatively short distance, the newly dead of their own species from the teeming living that surround them. I would not be surprised if smell held a very high place in the sensual life of these insects. The supply of vegetable food must be the main check to the unlimited increase of the swarm. And this must be taken into consideration by those who would fertilize these and wastes by elaborate schemes of irrigation. Water this desert, till the ground, clothe its surface with fertility and I can see no limit to locust increase (see methods adopted in Egypt)
I know nothing in the world of life to