TJie Rattle-Snake, 129 



of them in the species, or the species themselves 

 through their action. 



Without attempting, at this point, to discuss the 

 questions that might arise as to the origin of the 

 conjoined structure, function and Instinct, we pro- 

 ceed to call attention to a few facts that illustrate 

 the subject, and at least show more fully than has 

 thus far been done, the diversity of action of the 

 instinctive principle, and also how Instinct supple- 

 ments structure and function of organs, in higher 

 planes of action than the mere securing of food. 



We take as our first illustration that dreaded 

 reptile the Rattle-snake. We here find, first, the 

 grooved or perforated fang, — its point sharpened 

 like a chisel, on the most approved principles. This 

 instrument is folded away when not in use, but un- 

 sheathed and in position the instant it is needed. 

 As the tooth grew, all the straps and springs need- 

 ful for its most effective use grew with it. At its 

 base grows a gland secreting a deadly poison ; and 

 the opening of that gland is through the hollow 

 tooth. When the tooth makes its wound, the same 

 motion that drives it home, injects the poison. The 

 whole machinery is perfect. Structure and function 

 both agree in a complicated but perfect manner. 

 The result of their combined action, is death to the 

 victim. Now comes in the third element which we 

 call Instinct, guiding the voluntary action of the 

 snake. The tooth and the poison would have no 

 terror for us, were it not that the snake will strike 

 and do it effectively without instruction ! 



But the rattle of this reptile is another peculiar 



