The conquest of Mexico by Cortez first made the Spaniards acquainted with cochineal. They soon learnt to value it as one of the most important products of their new empire, and in order to secure its monopoly, prohibited, under pain of death, the exportation of the insect, and of the equally indigenous Nopal, or _Cactus cochinellifer_, supposing it not to be able to live upon any other plant. In the year 1677, however, Thierry de Meronville, a Frenchman, made an effort to deprive them of the exclusive possession of the treasure they guarded with such jealous care. Under a thousand dangers, and by means of lavish bribery, he succeeded in transporting some of the plants, along with their costly parasite, to the French colony of San Domingo; but, unfortunately, his perseverance did not lead to any favourable results, and more than a century elapsed after this first ineffectual attempt before the rearing of cochineal extended beyond its original limits. In the year 1827, M. Berthelot, director of the botanical garden at Orotava, was more fortunate in introducing it into the Canary Islands, where it thrives so well upon the Opuntia Ficus indica, that Teneriffe rivals Mexico in its production. At present Cochineal is not only raised in many other parts of the tropical world, but even in Spain, near Valencia and Malaga. The Coccus which produces lac, or gumlac, is a native of India, and thrives and multiplies best on several species of the fig-tree. A cheap method having been discovered within the last few years of separating the colouring matter which it contains from the resinous part, it has greatly increased in commercial importance. In the tropical zone we find that not only many birds and several four-footed animals live chiefly, or even exclusively, on insects, but that they are even consumed in large quantities, or eaten as delicacies, by man himself. The nomade of the Sahara and the South African bushman hail the appearance of locust swarms as a season of plenty and good living, and ants’ eggs eke out the meagre bill of fare of the wild Indians on the banks of the Orinoco. Several of the large African caterpillars are edible, and considered as a great delicacy by the natives. On the leaves of the Mopané tree, in the Bushman country, the small larvæ of a winged insect, a species of Psylla, appear covered over with a sweet gummy substance, which is collected by the people in great quantities, and used as food. Another species in New Holland, found on the leaves of the Eucalyptus, emits a similar secretion, which, along with its insect originator, is scraped off the leaves and eaten by the aborigines as a saccharine dainty. The chirping _Cicadæ_, or frog-hoppers, which Aristotle mentions as delicious food, are still in high repute among the American Indians; and the Chinese, who allow nothing edible to go to waste, after unravelling the cocoon of the silkworm, make a dish of the pupæ, which the Europeans reject with scorn.