232 VOCABULABY. 



CAR' TIL AGE. A solid part of the animal body, of a consistence 

 between bone and ligament, which, in the fetus is a substi- 

 tute for bone, but in the adult exists only in the joints, at 

 the extremities of the ribs, &c. 



CER'VICAL. Everything which concerns the neck, especially 

 the back part.* 



CHEVROTAIN'. A species of the genus Moschus, related to the 

 deer, but having no horns, and otherwise peculiar. It is 

 small, light, and graceful, and lives in the mountains of Asia, 

 from the Altai to Java. Dana. 



CHOROID MEMBRANE. A thin membrane, of a very dark color, 

 which lines the sclerotic internally. It is situate between the 

 sclerotic and retina, has an opening posteriorly for the pas- 

 sage of the optic nerve, and terminates anteriorly at the great 

 circumference of the iris, where it is continuous with the cili- 

 ary processes. The internal surface is covered with a dark 

 pigment, consisting of several layers of pigment cells. Its 

 use seems to be to absorb the rays of light after they have 

 traversed the retina. 



CIL'IARY. Relating to the eyelashes, or to cilia. This epithet 

 has also been applied to different parts, which enter into the 

 structure of the eye, from the resemblance between some of 

 them (the ciliary processes) and the eyelashes. 



COLON. That portion of the large intestines which extends 

 from the csecum to the rectum. The colon is usually divided 

 into four portions. 1. The right lumbar or ascending colon, 

 situate in the right lumbar region, and beginning at the 

 csecum. 2. The transverse colon transverse arch of the 

 colon the portion which crosses from the right to the left 

 side, at the upper part of the abdomen. 3. The left lumbar 

 or descending colon, extending from the left part of the trans- 

 verse arch, opposite the outer portion of the left kidney, to 

 the corresponding iliac fossa. 4. The iliac colon, or slgmoid 

 flexure of the colon ; the portion which makes a double cur- 

 vature in the left iliac fossa, and ends in the rectum. 



In the horse the colon is exceedingly large, and is capable 

 of containing no less than twelve gallons of liquid or pulpy 

 food. It is of considerable length ; completely traversing the 

 diameter of the abdominal cavity, it is then reflected upon 

 itself, and retraverses the same space. Touatt. 



