Members of (he Aquatic Salamander. 85 



of the stump continues after the growth has been nearly finished. 

 Except this appearance, which I have been led to regard as a sure 

 indication of future reproduction, no sign of it is ever to be observed 

 until after the perfect healing of the wound ; and any cause, acci- 

 dental or intentional, which obstructs it, impedes also the produc- 

 tion of the new member. 



This bulbous form of the stump is proved by dissection to arise 

 entirely from nicknamed vascularity. 



A short time after die cicatrix is formed, varying from one 

 day to six, a red projecting point is observed on its central part 

 from which the cuticle seems to have been absorbed. This 

 point is soft, and bleeds on being pressed. Its surface is moist 

 and glistening, secretes a glutinous fluid, which adheres to the 

 fingers on being touched. It is surrounded by a groove formed 

 by the cuticle of the cicatrix being elevated above the level of its 

 bone, in the form of a collar. The microscope discovers this spot 

 to be a reticulated cluster of red vessels, which have protruded 

 through the cicatrix. I have sometimes doubted whether thee 

 was a real protrusion, or whether a point of the cicatrix presented 

 that appearance, but the constant observation of the collar-like 

 elevation does not warrant any such doubt. In two or three days 

 more, generally about six from the period of cicatrization, this 

 red spot becomes a conoid protuberance, the base of which is of 

 a transparent grey colour, but the point is still covered with the 

 red vascular spot. Examination shews this cone to be composed 

 of a transparent grey homogeneous matter, soft and semi-consis- 

 tent, resembling coagulable lymph, or animal gluten, covered with 

 a thin filmy membrane. This cone continues to elongate, and the 

 red point gradually disappears sooner or later, according to the 

 extent of the joint which is first to be restored. The usual time 

 is about twelve days from the period o lcicatrization, when the new 

 growth is generally about a line and a half in length. But if a very 

 small part of the joint has been amputated, the red spot disap- 

 pears much earlier, and the elevation of the pew growth is hardly 

 perceptible, for this and the stump together bear always a constant 

 ratio to the length of the original joint, generally as two to three, 



