60 EDWARD C. DAY 



closely resembles the ventrad series with respect to these effects 

 of operations and recovery upon the initial rate and since the 

 results are even closely akin numerically, it must be concluded 

 that alterations of the initial rate give no evidence of any con- 

 trol exerted by the ganghon. 



TABLES 



Tables 1 to 3 were compiled from kymograph records. The 

 records were obtained by ticking off the passage of the waves of 

 contraction 'through the instrumentation of a Morse key in 

 circuit with an electromagnetic signal. 



For each graph thus secured there is given a statement in the 

 table of the number of beats occurring in successive alternating 

 ventrad and dorsad series, V standing for ventrad and D for 

 dorsad; and then an analysis of the italicized pair of these, show- 

 ing the time-rate for every ten beats of each series, together with 

 the pause intervening between two consecutive series. 



Table 4 is a rearrangement of the data contained in tables 1 

 to 3 for the sake of comparing, first, the number of beats in the 

 ventrad series for all three animals and in the dorsad series for 

 all three animals, and, second, the range in fluctuation for both 

 ventrad and dorsad series of beats. 



Table 5 is arranged to bring together the time-rates for com- 

 parison. The first six rows give the rates for the ventrad series 

 of all three animals and the last five rows give the rates for the 

 dorsad series. 



