272 



CHARLES G. ROGERS AND ELSIE M. LEWIS. 



in the copper wires and in the galvanometer which might tend 

 to disturb the results. Manipulation of the worms was reduced 

 to a minimum in order that nervous effects might not be intro- 

 duced to invalidate the temperature effects. Reading of the 

 rates of contraction of the dorsal blood vessel before and after 

 the insertion of the glass covered junction indicated that the mere 

 insertion of the instrument in the alimentary canal made no 

 difference with the rate. 



TABLE I. 



The preceding table, Table I., gives the data derived from the 

 actual experiments and also the values of the temperature 

 coefficient calculated from the data. In the tables the letters 



