10 



ANIMAL MECHANISM. 



manifestations of motion. Besides, tlie transformation of 

 motion into heat, into electricity, into light, may be proved 

 experimentally. 



Fig. 1 represents the details of the experiment. 



Fig. 1. — Showing' the transformation of the electricity of a battery into mecha- 

 nical action, into heat, light, and chemical action. 



Various instruments are so arranged upon a table that an 

 electric current, engendered by a battery P, may be made to 

 pass through them."^ The current is conducted in an elliptic 

 circuit, on a small square board, represented in the centre of 

 the figure. This circuit is formed of a thick copper. wire; 

 at certain points this wire is interrupted and dipped into 

 cups of mercury, from which other wires communicate with 

 the various apparatus through which the current is to be con- 

 ducted. In Fig. 1, the metallic bridges 1, 2, 3, 4, 5, connect 

 the cups of mercury, and form a complete circuit, which the 

 current may traverse without passing through the various 

 apparatus placed around it. 



If we take away loop No. 1, the current which passed 

 through that loop is forced to traverse the elliptical circuit 

 without passing through the surrounding apparatus. But if w^e 



* Instead of the single element represented in the Figure, it is necessary 

 to employ a series of Bunsen's cells, to realise the experiments perfectly. 



