CHARLES G. ROGERS AND ELSIE M. LEWIS. 



frame with cheese cloth in order to keep the junction in place, 

 and this was done in such a way as not to interfere in any way 

 with the passage of water over the gills. The animals were less 

 tractable than the salamanders and it was found difficult to keep 

 them in a single position near to the free junction of the couple 

 for a sufficient length of time to make a thoroughly satisfactory 

 series of readings. Just at this period in our work we were 

 annoyed by the present of a rather large and fluctuating parasitic 

 current in the system, so only one set of readings is here reported. 

 As far as the work upon the fishes was carried a temperature 

 adjustment to within one or two hundredths of a degree was in- 

 dicated. The figures in Table V. give the determinations as 



made. 



TABLE V. 



Goldfish. 



SUMMARY AND CONCLUSIONS. 



We find that the earthworm and the small salamander quickly 

 and closely adjust their body temperatures to that of their en- 

 vironment, the adjustment coming in most cases to within a few 

 thousandth of a degree Celsius over the ranges between i6-25 

 for the earthworm and i6-35 for the salamander. 



Clams and goldfish make the same adjustments but require 

 a longer time, from one half hour to one hour being required for a 

 shift v of 3-6 degrees Celsius. There is evidently in the forms 

 studied no mechanism for the regulation of heat production or 

 for heat loss from the body. Such heat as is produced in the 

 body is at once given off to the surrounding medium. 



