84 



A GLOSSARY OF TERMS 



nor vertebrae ; but they possess an 

 apparatus for breathing, have 

 jointed extrem':,ies, and generally 

 have wings. 



INSEC'TA. Lat. Insects. 



INSECTIVO'RA. Lat. Insectivorous. 



lNSECTi'voRous.-^-fr. lat. insecta, in- 

 sects ; voro, I eat. Insect-eating. 



INSERT'KD. fr. lat. insere're, to en- 

 graft. Attached ; set in ; growing 

 out of. 



INSESSO'RES fr. lat. insideo, to sit 

 upon. Perchers. An order of 

 birds, characterized by having 

 the hinder toe on the same level 

 with those in front. 



IN SITU. Lat. In place. 



INSTINCT. That sense or principle, 

 which leads animals to act alike 

 under all circumstances. Instinct 

 is exercised without instruction or 

 experience; the spider spins its 

 web. and the bird builds its nest 

 without being taught; and they 

 cannot improve in these acts. But 

 the acts of reason and intelli- 

 gence result from education and 

 experience, and are progressive 

 in improvement. 



INTEGRAL PARTICLES. The most 

 minute particles into which any 

 substance can be mechanically 

 divided, similar to each other, and 

 to the substance of which they 

 are parts. 



INTEGUMENT. fr. lat. tegere, to cover. 

 The skin. The covering of the 

 body. 



INTEN'ERATING. Having the power 

 of making tender, or of soften- 

 ing. 



IN'TERAMBULA'CRA. The irnper fo- 

 ra te plates which occupy the in- 

 tervals of the perforated plates, 

 or ambulacra, in the shells of 

 echinoderms. 



INTERCALATED. fr. lat. intercalo, I 

 place between. Placed between. 



INTERCALATION. The placing one 

 substance between others, as one 

 stratum between two others. 



INTEHCE'LLULAR. fr. lat. inter, be- 



tween ; cellulce, little cells. Placed 

 between cells. 



lNTERco'sTAL.-fr. lat. infer, between ; 

 costa, a rib. That which is situ- 

 ate between the ribs. 



IN'TERGANGLIO'NIC. Applied to 



nerves which are between gan- 

 glia. 



INTER-MAXILLARY. fr. lat. inter, be- 

 tween ; maxilla, the jaw. Bones 

 situate at the anterior part of the 

 upper jaw between its two sides. 



INTERNAL. See External. 



LN'TERNODE. The space between 

 one knot or joint and another. 



INTERPETIO'LAR. Between the peti- 

 oles or leaf-stalks. 



INTERPOSED. fr. lat. inter, between ; 

 pono, I place. Placed between. 



INTERRUPTED. Divided, separated. 

 A term denoting a disturbance of 

 a normal arrangement. A leaf is 

 said to be interruptedly pinnate, 

 when some of the pinnae are 

 much smaller than the rest, or 

 absent. 



INTERSPINAL. The interspinal bone* 

 form a series of strong, dagger- 

 like bones, deeply implanted in 

 the flesh along the middle line of 

 the body of fishes, between the 

 two great masses of lateral mus- 

 cles : their points generally pene- 

 trate to a little distance between 

 the spinous processes of the ver- 

 tebrae, to which they are connected 

 by a ligamentous attachment ; 

 whilst to their opposite extremity, 

 which may be compared to the 

 hilt of the dagger, the correspond- 

 ing fin-rays are affixed by a beau- 

 tiful articulation. Each interspi- 

 nous bone consists of two pieces 

 united by a suture ; one portion 

 representing the blade, the other 

 the handle of the dagger, to which 

 we have compared it. 



INTERTROPICAL. Between the tro- 

 pics. 



INTERVE'NIUM. fr. lat. inter, be- 

 tween ; vena, a vein. That por- 

 tion of the parenchyma of leaves, 



