896 REPORT OF COMMISSIONER OF FISH AND FISHERIES, 

 The followiiifj abstract from tables shows the truth of this: 



Number of table. 



5 

 5 



8 



8 



8 



9 



9 



9 



6 



6 



10 



10 



10 



11 



11 



11 



7 



7 



12 



12 



20 



20 



15 



15 



15 



16 



16 



19 



19 



19 



18 



18 



2 



2 



2 



21 



21 



21 



23 

 2J 



2 20 ) I 



2 20 51 



3 40) ] 



3 50 ^ ' 



4 ooS! 



4 00l! 

 3 oO>' 

 3 50 V 

 6 00 < 



6 00 5 I 



7 00) ' 

 6 00 > 



6 OOV 

 -■" to 8" 

 7°' to 8"" 



7 00 



7 00 ( 

 7 00 5 

 7 00 \ 

 7 00 5 

 Over 9™ 

 9"' to 10"" 

 5™ to O" 



5 00 

 5 00 

 9 00 

 9 00 



3 50 



6 00 



6 20 



7"' to 8" 



7 00 



Over 9" 

 9'" to 10-" 



Kemarks. 



Aquarium. 

 Tub. 



Do. 



Aquarium. 



Tub. 



Tub out S" at V". 

 Out 8" at 7 m. 



Aquarium. 



Do. 



At 9-° 1= out. 



At 9" i° out. 



Tub. 



At Sm lacked 2°. 



At S" lacked Ijo. 



Ac^uarium ; at 9™ lacked 1°. 



Aquarium. 



At 4°' lacked 5°. 2 ) 



At 4" lacked 5°. 8 ^ 5" to e"". 



At 4"" lacked 5°. 8 ) 



Aquarium. 



Still lacking 1°. 

 Still lacking 1°. 

 1° lacking and remained 



steady 15™ longer. 

 Lacking 2° ^ Not very ac- 

 Lacking 4° 5 curate. 



Thus, when the difference in temperature is less than 10°, "five min- 

 utes are sufficient"; but as the differences increase, so does the time 

 necessary to produce an equilibrium increase. The third experiment in 

 Table 21 points to the necessity of having the mercury perfectly at rest 

 when about to use the iustrumeut. 



An experiment was tried to ascertain the effect, if any, of the sun 

 shining on the stems of the thermometers, the temperature in the sun 

 being 71°; four theruiometers with bulbs level in a bath were recorded, 

 and the iustruments were entirely immersed, with following results: 



No. 1, 9 inches exposed, stood 3G°. 



No. 2, 4 inches exposed, stood 36o.5. 



No. 4, 6 inches exj^osed, stood 36°. 



No. 5, 6 inches exijosed, stood 360.5. 



Entirely immersed and read in two minutes they stood : No. 1, 36'^.2f 

 No. 2, 360; No. 4, 30°; No. 5, 36^.5. So that no appreciable error arises 

 from this cause. 



