of the Fishery Board for Scotland. 



129 



was carried on. The temperature of the air and particulars regarding 

 weather and tide are given in the Tables recording the numbers of 

 pelagic ova. The salinities were obtained from Mill's Papers,* and from 

 Dittmar's " Physical and Chemical Results of the ' Challenger.' " 



The highest temperature for the surface water was found in August, 

 when, on Station V., it registered 15*8°C. The lowest for the surface was 

 in February and March — viz., 6*7" at Station V. in February, and 6*5° in 

 the same region in March. The lowest temperature at 7g fathoms was 

 also found on Station V. — viz., 6*9° in February, while the highest at 

 that depth was 114° at Station I. in August. The lowest temperature at 

 15 fathoms was met with at Station V. in February, and the highest was 

 at Station II. in August. 



The lowest salinity was found on Station V., in March, when the 

 surface water was quite fresh. The surface water of Station I. in June 

 had the highest salinity— viz., 3*34. At 7| fathoms the salinity varied 

 from 2*58, Station V. in January, to 3*38, Station III. in June. The 

 water at 15 fathoms had its lowest salinity in January at Station IV, — 

 viz., 2*72, and its highest, 3'5, at Station III. in Juue. 



The temperature of the air varied from 4°C. in February to 18*5° on 

 10th of June. 



[Table. 



* "Report on the Physical Observations in the Forth and Clyde." Ninth Annual 

 Report of the Fishery Board. " Report on the Physical Observations on the Forth, Tay, 

 and Clyde." Eleventh Report, Ibid., "Clyde Area " on. cit. 



