of the Fishery Board for Scotland. 



429 



showing, as might be expected, a greater dependence on the air tempera- 

 ture, due to its greater proximity to land. 



Iu conclusion, we thank Messrs W. S. Bruce and J. Crystal Bell, who 

 have reduced all the specific gravity readings and determined the salinities, 

 and calculated the means published in the Tables ; and also Mr T. R. Marr 

 who drew one of the figures. 



1 8, 



—PHYSICAL OBSERVATIONS, 1891. 











I. 



FIXED STATIONS. 











TABLE t. — Temperature of Water- 



-Abertai 



i Light Vessel. 









Observations, 9 a.m. 







Observations, 3 I 



\M. 





Ten-clay Period. 

































Air. 



S 



urf. 



1 fm. 



3 fms. 



5 fms. 



Rot, 



Air. 



Surf. 



1 fm. 



3 fms. 



5 fms. 



Bot. 



1891. 































Apr. 1-10 



4-8 





4*2 



4 



4 



4-4 



4-4 



4-4 



6-9 



4-5 



4-5 



4-5 



4-6 



4*6 



„ 11-20 



9-4 





5-3 



5 



2 



5-2 



51 



5-1 



9-0 



5-6 



5-5 



5-5 



5-4 



5 4 



,, 21-30 



7-6 





6-7 



r, 



7 



6-6 



6-6 



6-5 



9-5 



6-7 



C-2 



G-l 



6-1 



G-0 



May 1-10 



8-9 





7-3 



7 



2 



7-1 



7-0 



6-9 



io-o 



7-4 



7 2 



7-0 



7-0 



0-8 



11-20 



10*3 





7-5 



7 



3 



7-4 



7-3 



7-3 



114 



7'8 



7-7 



7-6 



7-5 



7-5 



„ 21-31 



10-4 





8-7 







8-4 





8-3 



11-3 



8-6 





8-3 





8-2 



June 1-10 



10-7 





9-1 







9 3 





9-3 



12-6 



9-4 





9-3 





9-3 



„ 11-20 



13-6 



10-3 







9-7 





9-7 



15-6 



11-6 





10-6 





10-5 



„ 21-30 



15-7 



11-8 







11-8 





11-5 



15-7 



11-8 





11-5 





11-9 



July 1-10 



15-6 



11-5 







12-3 





11-9 



18-4 



11-2 





11-8 





116 



H-20 



16-0 



13 1 







12-5 





12-3 



18-3 



14-0 





13-6 





13-1 



„ 21-31 



14-3 



12-9 







12-8 





12-7 



16*9 



12-6 





12-4 





12 4 



Au£?. 1-10 



151 



13-2 







13-2 





12-9 



16-9 



12-9 





12-6 





12 (i 



„ 11-20 



13*9 



13-5 







13 1 





13 0 



17-7 



13*8 





135 





13-2 



„ 21-31 



14-4 



131 







131 





131 



15-3 



13*4 





13 2 





13-1 



Sept. 1-10 



13-0 



128 







12-8 





127 



15-3 



13-0 





12-7 





12-6 



„ 11-20 



14-8 



13-0 







12-9 





12-8 



16-1 



133 





130 





12-8 



„ 21-30 



12-2 



11-7 







11-7 





11-7 



13-9 



11-9 





11-6 





11 -6 



Oct. 1-10 



ll'O 



11-4 







115 





11-6 



14-8 



117 





11-7 





11-7 



H-20 



9*2 



102 







106 





10-7 



11-0 



10-8 





110 





11-2 



„ 21-31 



7-2 





9-4 







10-1 





10-2 



10*4 



9-6 





10-4 





10 4 



Nov. 1-10 



7-4 





9-0 







9-4 





9-(i 



8-5 



9-6 





io-o 





9-9 



H-20 



6-8 





7-6 







8-3 





8-7 



8-6 



8-8 





9-3 





9-3 



„ 21-30 



4-0 





7-4 







8-4 





8-8 



4*9 



7-6 





8-6 





8-9 



Dec. 1-10 



6-2 





6-7 







7-5 





7-6 



7-G 



7-4 





8-2 





8-3 



,i H-20 







5-7 







6-7 





6-8 



4-9 



6-7 





7-3 





7-5 



,, 21-31 



3-5 





5-9 







7-1 





7-3 



4-5 



5-8 





7-0 





7-2 



TABLE II. — Temperature of Water- 



— Abertay Light Vessel. 











Monthly Means. 











1 — 



Montb. 



Observations, 9 a.m. 



Observations, 3 p.m. 





























Air. 



Surf. 



1 fm. 3 fms. 5 fms. 



I 



Bot. 



Air. 



Surf. 



1 fm. 



3 fms. 



5 fms. [ Bol 





1891. 

























April 



7-3 



5-4 



5-4 5-4 



5-4 



5'3 



8-5 



5-6 



5-4 



5-4 



5-4 5- 



3 



May 



9-9 



7-9 



7-2 , 7-6 



7-1 



7-5 



10-9 



7-9 



7-4 



7-6 



7-2 7%> 



June 



133 



10-4 



... | 10-3 





10-2 



14-6 



10-9 





105 



10-5 



July 



15 3 



12 5 



... j 12-5 





12 3 



17-9 



12-6 





12 6 



... 1 124 



August 



14 5 



13-3 



13-1 





13-0 



16-6 



13-4 





13 1 



130 



September 



13 3 



125 



125 





12-4 



15 1 



12-7 





12-4 



... , 123 



October 



9-1 



10-3 



10-7 





10-8 



12 1 



10-7 





11-0 



... 1 11- 



1 



November 



61 



8-0 







9-0 



7 ■'■'> 



8-7 





9-3 



... I 9-4 



December 



4-3 



61 



::: | H 





7-2 



5-7 



! 



6-6 





7-5 



1 7. 



1 



7 



