376 



REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



and in my opinion a steady temperature of 59° to 60° would have given 

 far different results. 



Mather and Bell's apparatus. 



The above tables are accurately copied from the record-sheet, and it is 

 proper to add a word about the thermometers used. In the first two trials 

 made upon the piazza, we had a small pocket-thermometer, only gradu- 

 ated to two degrees, and which registers two degrees higher than the 

 one used in the cellar in the two last trials ; but having no opportunity 

 to correct the instruments, I give the record as it appeared at the time; 

 but if the pocket-instrument was correct, then the records of the last 

 two trials should read two degrees lower than shown in the tables. 



In conclusion I will say, I believe that shad-fry can be taken across 

 the Atlantic by hatching the eggs in transit in the can last described ; 

 and as the record of my trip last season showed the temperature of the 

 water in the cans at sea without ice to be about 62°, that would seem, 

 according to the above tables, to be about the proper point. It could 

 probably be kept from 60° to 64° without the use of much, if any, ice, 

 by opening or closing the hatches. 



