Ophidians, zoological arrangement of the different genera, including varieties known in North and South America, the East Indies, South Africa, and AustraliaTheir poisons, and all that is known of their natureTheir galls, as antidotes to the snake-venom .. . fter contact with venom. By S. WeirMitchell, Structure of the Venom- Gland. The sfigma shown in Fig. 15 gives the microscopical ap-pearance of the structure of the venom-gland. The coeca lie in the centre, and the ducts are disposed oneither side parallel to each other. Outside of the cellular layer, the poison-duct is made upprincipa
Ophidians, zoological arrangement of the different genera, including varieties known in North and South America, the East Indies, South Africa, and AustraliaTheir poisons, and all that is known of their natureTheir galls, as antidotes to the snake-venom .. . fter contact with venom. By S. WeirMitchell, Structure of the Venom- Gland. The sfigma shown in Fig. 15 gives the microscopical ap-pearance of the structure of the venom-gland. The coeca lie in the centre, and the ducts are disposed oneither side parallel to each other. Outside of the cellular layer, the poison-duct is made upprincipally of white fibrous tissue, with a small proportion ofvery fine fibres of yellow elastic tissue. The walls of the ductare provided throughout with an abundant supply of blood-vessels. Its communication with the fang and the mode ofinjection of the poison have been described on another page,and any one desirous of knowing all the details of a minute 184 OPHIDIANS. description of these parts is referred to Rymer Jones, articleReptilia/ Cijdopcedia of Anatomy and Physiology; J. , De la Vipere/ Paris, 1855; and Owen, on theSkeleton and Teeth, Philadelphia, 1854. A consultationof these works, in connection with Dr. S. AYeir Mitchells Fig. 15.*. a, a. Secernent coeca. 6, b, b. Small ducts. Researches, will furnish an exhaustive study of the subjectin reference to Ophidians provided with fangs. I intend to publish, at a future day, a like study of thesame apparatus in poisonous serpents not provided with fangs;such, for example, as the Vipera elaps corallinus. It must always be borne in mind, hoAvever, in this connec-tion, that there is a wide difference in many respects between * Eesearches, &c., by Dr. S. Weir Mitchell, p. 13. VIPERA PSEUDECHIS MAJOR. 185 poisonous reptiles in temperate zones or cold climates andthe same species in torrid zones. In the tropics, on the AndesMountains, for example, this fact is so plainly evident that,by referring to the tabular list of sn
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Keywords: ., bookcentury1800, bookdecade1870, bookidophidia, booksubjectsnakes
