144 THE ROYAL SOCIETY OF CANADA 



Analyses of Solar Salts. ' 



Trapani Iviza 



Moisture 6.45 3.71 



Calcium chloride .30 .47 



Magnesium 1.11 .... 



Magnesium sulphate 1.64 .76 



Sand or Silica .14 .06 



Sodium chloride... .. .. 89.50 94.40 



Turks Islands Mediterranean 



Insoluble -0.18 0.27 



Lime 0.72 0.35 



Magnesia 0.48 ' 0.47 



Sulphuric anhydride 1 . 20 1 . 20 



Sodium chloride ••,••.•• 97.42 97.97 



Comparison of these two different types shows that the solar 

 salts contain greater quantities of impurities, such as calcium and 

 megnesium chlorides and magnesium sulphates. 



We have examined a large number of salts used for curing fish 

 by various methods as follows : — 



Method A. — Fresh cod cut in pieces, placed in sterile dishes, 

 sprinkled with various samples of salt, and incubated at 37° C. ; the 

 water poured off and more salt added when necessary. 



Method B.- — ^Salt sprinkled on codfish agar plates which were 

 moistened when necessary with sterilized codfish broth, or on sloped 

 codfish agar in tubes; both kept at 37° C. 



Method C. — Salt sprinkled on sterilized cured codfish in test 

 tubes, incubated at 37° C. 



Method D. — Salt placed in sterilized codfish broth, containing 

 a strip of filter paper, half in and half out of the liquid, incubated at 

 37° C. 



The samples of salt tested were secured from dealers, who, as 

 a rule, were able to state where the salt came from ; from large fishery 

 companies, from fishery officers and from fishermen who gave no 

 information as to the source of the salt sample. 



