250 



Papers from the Department of Marine Biology. 



subjected to ni/8 butyl alcohol for an hour in a tube containing sand. 

 Some were then returned to sea-water and recovered, showing that the 

 animals were truly narcotized. The remaining animals were shaken 

 up and broken to pieces by the sand. At the same time, a control lot 

 kept for the same period in sea-water in a tube containing sand were 

 shaken and broken up. A comparison of the two tubes showed that 

 the anesthetized animals were not nearly so bright as the control lot. 

 A microscopic examination of the material showed that the cells were 

 completel}^ broken to pieces into irregular fragments by the sand. A 



Table 6. — Effect of anesthetics. 



'The normal response at the start is d jubtless due to the delay in taking effect on certain of 

 the animals. 



