GLOSSARY. 467 



HERBIVOROUS, living upon herbs. The Herbivora are those 

 animals that feed on herbaceous plants. Lat. herba, an 

 herb, and voro, I eat. 

 HETEROGENEOUS, of a different kind or nature. Gr. 1ieteros y 



different, and genos, a kind. 

 HEXAGONAL, having six sides and six angles. Gr. hex, six, 



gonia, an angle. 



HU'MERUS, the bone between the elbow and shoulder. 

 HUMOURS OF THE EYE, the transparent portions consisting of 

 what are termed the " watery, the " crystalline," and the 

 "vitreous" humours. 



HYBER'NATE, to retire into close quarters during the winter 

 season. The Dormouse and the Marmot furnish familiar 

 examples of hybernation. Lat. hybernus, belonging to 

 winter. 



HYDROI'DA, an order of Zoophytes ; so called from their resem- 

 blance in some particulars to the fabled Hydra. 

 HY'DROGEN, a gas forming one of the component parts of water 

 and of atmospheric air. Gr. hydor, water, and gennao, I 

 produce. 



HYMENOP'TERA, an order of insects comprising Bees, Wasps, 

 and Ants: they are furnished with four membranous wings. 

 Gr. hymen, a membrane, and pteron, a wing. 

 HYPO'THESIS, a supposition. 

 ICTHYO'LOGY, the department of natural history treating of 



fishes. Gr. icthys, a fish, and logos, a discourse. 

 JMA'GO, a term applied to Butterflies and other insects, when 

 their transformations are completed, and they assume the 

 appearance of the species in its perfect state. 

 IMPETUS, the force by which a body is impelled. 

 INCISORS, the front or cutting teeth. Lat. incisores, a cutting. 

 INCUBATION, the act of sitting as birds do on eggs, to develope 



the contained embryo. Lat. incubo, I sit. 

 INDIGENOUS, produced naturally in a country; not exotic. 

 IN'DURATED, having become hardened. Lat. indurare, to make 



hard. 

 INDUCTION, an inference or general principle drawn from a 



number of particular facts. 



INFEROBRAN'CHIATA, an order of molluscous animals, having 

 the gills placed under the projecting margin of the mantle. 

 The term simply means, having the gills below. 

 INFUSO'RIA, the class of animalcules so called from their abound- 

 ing in certain animal and vegetable infusions. 

 INSECTA, insects. They form one class of articulated animals. 

 INSECTI'VORA, an order of mammalia, the individuals of which, 

 like the Mole or the Hedgehog, feed on insects and worms. 

 Lat. insecta, insects, voro, I devour. 

 INSESSO'RES, the order of perching birds. Lat. sedere, to sit, 



to rest upon. 

 INTEGUMENT, that which naturally invests or covers another 



thing. Lat. intego, I cover. 

 INTERSTICES, the spaces between objects. Lat. interstitium. 



