412 



H. M. Vernon 



examined as to its chemical and physical properties. These obser- 

 vatioDS, together with a few addìtional ones made from time to time, 

 are collected together in the accompanying table. 



Date 



Tem- 

 perature 

 of 

 water 



Corrected 

 Specific 



Gravity at 

 15.5fi°C. 



Amonnt, in 

 mgm. per 

 li tre, of 



free 

 NH3 



Organ, 

 NH3 



Date 



Tem- Corrected 

 pera ture Specific 



of 

 water 



Gravity at 

 1 5.5(5° C. 



Amount, in 



nigm. per litre, 



of 



free 

 NH3 



organ. 

 NH3 



- ^ 



9. IV U.b" 



10. 

 22. 



5.V 

 14. 

 24. 

 29. 



2. VI 

 11. 

 16. 

 22. 



1.3.7" 



14.58" 



16.38" 



15.82" 



16.94" 



17.9" 



18.9" 



19.42" 



19.28" 



19.20" 



1.02859 

 1.02879 

 1.02883 

 1.02875 

 1.02866 

 1.02897 

 1.02898 

 1.02883 

 1.02880 

 1.02893 

 1.02894 



.236 

 .185 

 .215 

 .235 

 .202 

 .223 

 .208 

 .268 

 .227 

 .224 



l.VII 



9. 

 17. 



ll.VIU 

 16. 

 20. 

 30. 



10. IX 

 27. 

 11. X 



4. XI 



21.80" 



22.80" 



22.24" 



22.80" 



23.0" 



23.2" 



23.40" 



22.63" 



22.78" 



16.47" 



14.90" 



.02928 

 .02914 

 .02886 

 .02940 

 .02962 

 .02964 

 .02958 

 .02952 

 .02957 

 .02930 

 .02932 



.278 

 .350 

 .340 

 .193 

 .201 

 .219 

 (.146 

 .251 

 (.074 

 .242 

 .188 



.143 

 .125 

 .135 

 .143 

 .118 

 .122 

 .114) 

 .129 

 .094) 

 .157 

 .131 



69 

 96 



63 



75 

 76 

 65 

 67 



The specific gravity of the water was taken very carefully by 

 means of a specially made hydrometer, which, by coraparison with 

 a direct determination made by meaus of a specific gravity bottle, 

 was found to give accurate results. The valnes giveu in the table 

 are all corrected to a temperature of 15.56° C, or 60° F., in accordance 

 with the tables given by Dittmari. From these corrected values 

 we See that the salinity was at its minimum in the spring. After a 

 slight rise, it kept fairly Constant tili the end of June, and then 

 began to rise again. It reached its maximum vaine on Aug. 20"', 

 but from this point tili the beginning of November, or as long as 

 the observations were continued, it still kept at nearly the same high 

 value. The extreme ränge varied from 1.02859 to 1.02964, which 

 corresponds to a Variation of about 3.7^ in the salinity. The salinity 

 of the water was only slightly greater than that of open sea-water, 

 as the following (corrected) values show. 



' Challenger Reports. Vol. 1 pag. 70. 



