118 Table of Contents. 



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the 17th century, 266. The number of catalogued species, 266. Lord 

 Walsingham's estimate of three millions of species in the entire world, 



266. An occasion when more Poduras could be seen at a glance than 

 there are human beings on the globe, 266. Dr. Fitch's estimate of the 

 number of plant-lice on a small cherry-tree, 266. Time required to 

 count a million, 266. Nearly a year would be required to count the 

 aphides on the one cherry-tree, 267. 4. Rapidity of Insect Propaga- 

 tion, 267. The maximum of rapid increase found in the Aphides, 



267. Their peculiar generation, 267. Thirteen generations of the hop- 

 vine aphis observed in one year, 267. The amazing number of the 

 13th brood if each individual should attain maturity, 267. The 

 distance in space to which the brood would extend if marshalled in 

 continuous line, 267. The point, even measured by the velocity of 

 light, inconceivably distant, 267. The necessity of checks in nature 

 to unrestricted development of any living form, 267. 5. The 

 Voracity of Insects, 268. The larval stage one of incessant 

 feeding, 268. Their only periods of rest, 268. Increase of weight 

 of a flesh-feeding larva in twenty-four hours, 268. Its parallel in the 

 food of an infant, 268. Increase in weight of a caterpillar during its 

 progress to maturity, 268. A corresponding weight of a man, 268. 

 Can Insect Ravages be Prevented ? 268. Not entirely, but con- 

 trolled, 268. Knowledge of the entire life-history of an insect will 

 disclose some vulnerable point, 268. With present knowledge, insect 

 depredations could be reduced one-half, 269. How to Meet our 

 Insect Enemies, 269. What may be done by high culture, 269. The 

 feeble plants succumb to attack, 269. Sickly or diseased vegetation 

 invites its insect enemies, 269. Attracted thereto by its acute sense of 

 smell, 269. A belief that insect pests are never drawn to healthy vege- 

 tation, 269. Clean culture of great value, 269. Field and garden refuse 

 a favorite retreat for many of the hibernating Hemiptera, 270. The 

 benefit of destroying hibernating insects, 270. All worthless, dead 

 vegetable matter should be burned or composted in the autumn, 270. 

 Importance of knowing our insect enemies, 270. Can not be success- 

 fully met without a knowledge of who and what they are, 270. Does 

 the study seem too formidable, 270. One hundred species may include 

 all that it is important for the agriculturist to study, 270. Their com- 

 mon and scientific names should be learned, 270. Pests that operate 

 secretly, and known only by their effects, should be sought out, 270. 

 Species falling in this category, 270. Indications of attack should be 

 watched for, 270. Enlist children in the study, 270. Interest attaching 

 to the development of an egg into the perfect insect, 271. Encourage 

 children to make a collection of insects, particularly of the injurious 

 species, 272. Dr. Packard's" Entomology for Beginners'" recommended, 

 272. Benefits to children of the study, 272. Recent entomological 

 publications should be procured and studied. 272. The richness 

 of the United States publications, 272, A large proportion of them 

 distributed gratuitously, 272. Reports of the Entomologist of 



