56 



Prof. T. E. Thorpe on the History of the 



Barium chloride . 

 Strontium chloride 

 Calcium chloride . 

 Calcium fluoride . 

 Calcium phosphate 

 Magnesium chloride 

 Potassium chloride 

 Lithium chloride . 

 Ammonium chloride 

 Sodium chloride . 

 Sodium sulphydrate 

 Magnesium bromide 

 Magnesium iodide 

 Calcium carbonate 

 Magnesium carbonate 



Silica 



Alumina and organic matter 



1000 grams. 



In 1 gallon 



grams. 



grains. 



0-09277 



6-566 



traces 



traces 



0-61649 



43-635 



traces 



traces 



traces 



traces 



0-68212 



48-281 



0-13553 



9-592 



0-01064 



0-753 



0-01457 



1-031 



12-62657 



893-670 



0-07369 



5-215 



0-03226 



2-283 



0-00160 



0-113 



0-42061 



29-768 



0-08410 



5-953 



0-00991 



0-701 



traces 



traces 



14-80086 1047-561 



Amount of soluble matter obtained by direct evaporation 

 and dried at 170°-190°, 14-7940 grams in 1000 grams. 



The amount of the solid matter obtained by direct evapora- 

 tion is slightly lower than that calculated from the several 

 results of the analytical operations. This, indeed, was to be 

 expected from the character of certain of the constituents. The 

 magnesium salts tend to become basic on drying : and the am- 

 monium salt and the alkaline sulphydrate would be decomposed. 



It has not been thought necessary to ascertain the amount 

 and nature of the gases expelled from the water by boiling. Such 

 determinations have in great measure lost their significance 

 since Dr. Jacobsen and Mr. Buchanan have shown that the 

 saline matter in the water interferes greatly with the complete 

 expulsion of the dissolved gases. The amounts, however, of 

 free carbon dioxide and hydrogen sulphide (the most important 

 of the gaseous constituents) are readily deduced from the ana- 

 lytical results. They are as follows : — 



Vol. of dissolved gases at 

 10° and 760 millims. 



In 1000 grams. 

 Sulphuretted hydrogen 36*28 cub. cent. 

 Carbon dioxide . . . 143-17 



In 1 gallon. 



10-16 cub. in. 



40-10 „ 



Almost exactly one half of the total amount of carbon dioxide 

 in the water is in a state of combination, the other half being 

 free or existing as the so-called acid carbonates. The volume 

 of the free gases thus formed is considerably larger than is 



