Entomology

the branch of zotlogy which treats of insects. Insects exceed in number all other animals taken together. Over 80,000 species of beetles or coleoptera and about 15,000 moths and butterflies have been recorded; and Speyer estimates the total census at 200,000, while M’Lachlan concludes that future entomological industry will raise ‘the _ total of insect species to a milion. As far as insects are concerned, the struggle between man and animals is by no means finished. Strong in numbers) many of them are directly or indirectly injurious to man and his property to an extent which frequently affects the prosperity of a nation. Direct injuries to man’s person are familiarly illustrated in the parasitism of fleas, lice, etc., but these are le important than the share the mosquito seems to have in the loathsome disease Elephantiasis arabum. Personal injuries are dwarfed wten we think of those done to property,’ and especially to crops and herds, by voracious or parasitic insects.