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through all parts of the body; 

 they possess compound eyes. All 

 insects, which possess wings, me- 

 tamorphose, or pass through certain 

 changes, before they arrive at their 

 perfect form. In their first state, 

 after leaving the egg, they form 

 larvae, or caterpillars. The bodies 

 of insects are divided into head, 

 corslet, pectus, abdomen, and mem- 

 bers. The head is joined to the 

 body, in some, by ball and socket ; 

 in others, by plain surfaces ; in 

 others, after the manner of a hinge. 

 In some, the connection is entirely 

 ligamentous, the different motions 

 corresponding with the nature of 

 the joint. The corslet or thorax, 

 is situated between the pectus and 

 head. The first pair of feet are 

 joined to this, and it contains the 

 muscles for moving those and the 

 head. To the upper and lateral 

 part of the pectus, the wings, when 

 present, are fixed, and the four 

 posterior feet to its under part. 

 To the upper part a horny process 

 is frequently fixed, termed scutel- 

 lum, or escutcheon. The pectus 

 contains the muscles which move 

 the wings and four pair of the feet. 

 -Fyfe. 



Cuvier divided insects into twelve 

 orders, but modern classification 

 places Insecta as the first class of 

 the sub-kingdom Annulosa, divi- 

 ding the class into nine orders. 



INSECTI'VORA. (from insect and voro, 

 Lat.) In Cuvier's arrangement, 

 a family of animals which lead 

 a subterraneous life, and having 

 grinders studded with conical points. 

 They live principally on insects, 

 and many of them, in cold climates, 

 pass the winter season in a state of 

 torpidity. The hedgehog and mole 

 are examples. 



IN SITU. A mineral is said to be 

 in situ, when in its natural place 

 or position. 



I'NTEGRAL. (integral, Fr. integrate, 

 It. integer, Lat.) A portion of a 



whole, being similar to the whole 

 and not an elementary portion. 

 Thus the smallest portion of car- 

 bonate of lime is still carbonate of 

 lime, but if by any means we 

 separate the carbonic acid from the 

 lime, we no longer have in these, 

 separately, integral portions but 

 the elementary parts. 



INTERCO'STAL. (from inter and costa, 

 Lat. intercostal, Fr.) Anything 

 between the ribs, as the intercostal 

 muscles, intercostal arteries, nerves, 

 or veins. 



INTERNO'DAL. (from inter and nodus, 

 Latin.) Applied to flower-stalks 

 proceeding from the intermediate 

 space of a branch between two 

 leaves. 



I'JSTTERNODE. The space between one 

 knot or joint and another; a term 

 used both in conchology and botany. 



INTERO'SSEAL. | (from inter and os, 



INTERO'SSEOTJS. j Latin.) Placed 

 between bones, as interosseous 

 muscles, arteries, veins, &c. 



INTERRUPTEDLY. In botany, applied 

 to compound leaves when the prin- 

 cipal leaflets are divided by intervals 

 of smaller ones; applied also to 

 spikes of flowers, when the larger 

 spikes are divided by a series of 

 smaller ones. 



INTESTI'NA. Linnaeus divided the class 

 Vermes, or worms, into five orders, 

 the firstof whichhe named intestina; 

 these mostly inhabit the bodies of 

 other animals; they are denomi- 

 nated the most simple animals, 

 being perfectly naked, and without 

 limbs of any kind. Cuvier has 

 divided them into cavitaria, or 

 nematoidea, and parenchymata. 

 The cavitaria or nematoidea are 

 worms having cavities or stomachs, 

 or an intestinal canal floating in 

 a distinct abdominal cavity, such 

 canal extending from the mouth 

 to the anus. The parenchymata 

 comprises those species in which 

 the body is filled with a cellular 

 substance, or with a continuous 



