TARSAL CHEMORECEPTORS OF BUTTERFLIES 



199 



was tested. At the close of the last two experiments described 

 above (table 5, 2f, 3f), the animals were fed on 1 M saccharose 

 solution. In experiment 2f the twelve butterflies, after being 

 fed, were 'rested' for forty-eight hours. The antennae, labial 

 palpi, and rudimentary fore legs were then removed. Seventeen 

 hours after the operation, sixty-five hours after being fed, the 

 nine surviving animals were subjected to the same experiment 

 as before. In experiment 3f a similar procedure was followed, 

 the animals being 'rested' forty-three hours after feeding, oper- 

 ated upon, and one hour later subjected to experiment. 



TABLE 6 



Pyrameis 



The results obtained from the operated animals are presented 

 in table 6. They agree in every respect but one with the results 

 obtained from unoperated animals. The one point of difference 

 is in experiment 3g, in which a 1 M NaCl solution, instead of being 

 the least effective of the substances employed, became equal to 

 the most effective and produced a response in every trial. The 

 loss of sense organs entailed by the removal of the appendages 

 enumerated cannot account for this result. For, under the con- 

 ditions of the experiment, such sense organs could have been 



