METHOD OF RECORDING EGG DEVELOPMENT. 



189 



such, for example, as the extremely low temperatures iu cod work and 

 abnormally high temperatures for those species of Salmonidce, that 

 naturally seek glacial waters for their spawning-grounds. 



The accompanj^ing extract from the temperature sheets of Baird 

 Station shows the record of water-temperatures and the manner in 

 which the age of the eggs was kept. It will be noticed that the daily 

 mean is compiled from the morning and evening temperatures only, 

 as by repeated trials they were shown to be the maxima and minima. 

 It would have been better, perhaps, to have had readings every 3 

 hours, as the times during which these temperatures prevailed would 

 have been more accurately gauged and a slightly different norm would 

 probably have been found. The test, however, was thought to have 

 been sufficiently thorough to show the value of the system. 



Extract from Baird water-temperature record. 



Date. 



Temperature. 



Temp, 

 unit. 



Date. 



Temperature. 



Temp. 



6 a. m. 



12 m. 



6p.m. 



Mean. 



6 a.m. 



12 m. 



6 p.m. 



Mean. 



unit. 



1898. 













1898. 













Aug. 16 



55 



59 



61 



58 





Oct. 19 



47 



49 



51 



49 



1322.5 



17 



54 



60 



60 



57 



"'"26" 



20 



46 



49 



51 



48.5 



1339.5 



18 



54 



59 



59 



56.5 



51 



21 



46 



49 



51 



48.5 



1356 



19 



53 



59 



59 



56 



75.5 



22 



46 



49 



51 



48.5 



1372. 5 



Sept. 6 



51 



56 



58 



54.5 



499 



23 



49 



50 



51 



50 



1389 



7 



52 



56 



57 



54.5 



521.5 



24 



47 



48 



50 



48.5 



1407 



8 



51 



56 



57 



54 



544 



25 



45 



47 



49 



47 



1423.5 



9 



51 



56 



57 



54 



566 



26 



46 



48 



49 



47.5 



1438.5 



10 



50 



53 



56 



53 



588 



27 



46 



48 



50 



48 



1454 



11 



50 



53 



55 



52.5 



609 



28 



45 



48 



50 



47.5 



1470 



12 



50 



55 



56 



53 



629.5 



29 



45 



47 



49 



47 



1485.5 



13 



50 



54 



55 



52. 5 



a50.5 



30 



46 



48 



50 



48 



1500.5 



14 



50 



52 



55 



52.5 



671 



31 



48 



49 



50 



49 



1516.5 



15 



50 



54 



56 



5:3 



691.5 



Nov. 1 



46 



48 



49 



47.5 



1533. 5 



16 



50 



54 



56 



53 



712.5 



3 



44 



46 



47 



45.5 



1549 



17 



50 



53 



55 



52.5 



733.5 



3 



45 



4() 



47 



46 



1562.5 



18 



52 



54 



56 



54 



754 



4 



44 



49 



50 



47 



1576.5 



19 



■51 



54 



56 



53.5 



776 



5 



46 



49 



50 



48 



1591.5 



20 



50 



53 



55 



52.5 



797.5 



6 



46 



47 



48 



47 



1607. 5 



21 



51 



52 



53 



52 



818 



7 



44 



46 



47 



45.5 



1623.5 



22 



51 



52 



54 



52.5 



838 



8 



43 



46 



45 



44 



1636 



23 



50 



53 



54 



53 



858.5 



9 



43 



44 



45 



43.5 



1648 



24 



50 



52 



53 



51.5 



878.5 



10 



41 



4;^ 



45 



43 



1659.5 



25 



50 



52 



53 



51.5 



898 



11 



43 



44 



45 



43.5 



1670.5 



26 



51 



53 



54 



52.5 



917.5 



12 



42 



44 



45 



43.5 



1682 



27 



51 



53 



55 



53 



938 



13 



42 



44 



45 



43.5 



1693. 5 



28 



50 



53 



53 



51.5 



959 



14 



42 



44 



45 



43.5 



1705 



29 



48 



51 



52 



50 



978.5 



15 



42 



44 



45 



43.5 



1716.5 



;«) 



42 



49 



50 



46 



996.5 



16 



44 



45 



45 



44.5 



1738 



Oct. 1 



45 



47 



49 



47 



1010. 5 



17 



44 



46 



47 



45.5 



1740.5 



2 



46 



48 



49 



47.5 



1025.5 



Dec. 30 



38 



39 



40 



39 



3308 



3 



47 



49 



49 



48 



1041 



31 



38 



39 



40 



39 



3315 



. 4 



48 



49 



50 



49 



1057 















5 



46 



48 



49 



47.5 



1074 



1899. 













6 



48 



49 



51 



49.5 



1089.5 



Jan. 1 



34 



34 



34 



34 



3323 



7 



49 



50 



50 



49.5 



1107 



2 



34 



36 



37 



35.5 



3334 



8 



48 



50 



51 



49.5 



1124.5 



Feb. 18 



40 



59 



57 



48.5 



269(5 



9 



49 



51 



51 



50 



1143 



19 



41 



58 



57 



49 



2713. 5 



10 



49 



51 



52 



50.5 



1160 



20 



38 



52 



53 



45.5 



2739.5 



11 



50 



53 



53 



51.5 



1178.5 



21 



37 



50 



52 



44.5 



2743 



13 



49 



53 



52 



50. 5 



1198 



22 



40 



52 



56 



48 



2755.5 



13 



49 



52 



54 



51. 5 



1216.5 



23 



40 



52 



55 



47.5 



3771.5 



14 



49 



51 



53 



50.5 



1236 



24 



37 



50 



50 



43.5 



3787 



15 



48 



51 



51 



49.5 



1254.5 



25 



37 



49 



49 



43 



3798. 5 



16 



49 



51 



51 



50 



1272 



26 



36 



55 



50 



43 



2809.5 



17 



46 



49 



50 



48 



1290 



27 



41 



53 



50 



45.5 



2820.5 



18 



46 



49 



51 



48.5 



1306 



28 



46 



48 



48 



47 



2834 



In the table following is submitted a list of eggs hatched at Baird 

 during the season of 1898-99, showing, for each lot of eggs, the date 

 of taking, date of hatching, and number of days and number of tem- 



