364 



J. M. D. OLMSTED 



TABLE 6 

 The effect of suddenly transferring Synaptulae from sea-water of 27°C. to that of 

 different temperatures, leaving them 3 minutes, and then returning them to that 

 of 27° 



Local application of heat was tried with negative results. 

 A glass tube of small bore was bent into a narrow U, the ends 

 of which passed through a cork for convenience in holding. By 

 means of a siphon and rubber tubing, hot water was continually 

 passed through the U-tube. The mean between the temper- 

 ature at which the water entered and that at which it left the 

 tube was taken as the temperature at the middle region of the 

 system where the U-tube was situated. 



