REPORT OF TEE CEIEF ASTRONOMER 



653 



SESSIONAL PAPER No. 25a 



complete than that of the first sample. The two gave results shown in Columns 

 1 and 2 of Table XXXIX:— 



Table XXXIX. — Analyses of Ottawa river. 



Low water. 



Total solids at 98-100° centigrade . 



Loss on ignition 



Solids after ignition 



SiOo.... 

 A1 2 3 . . . 

 Fe 2 3 .. 



MgO. . 

 CaO... 

 Na„0... 

 K»0... 



so s .... 



Mn,G 4 . 



F„6 5 ... 

 CI ... 



Parts per million. 



52 

 38 

 34 



3-87 



12-57 



not det. 



not det. 



370 

 not det. 

 not det. 

 not det. 



High water. 



Parts per million. 



Five sanitary analyses of the Ottawa river water have been made by Mr. 

 Shutt. The samples were taken on the following dates: December 22, 1887; 

 October 18, 1898 ; December 7, 1898 ; May 8, 1899 ; and August 22, 1905. These 

 analyses gave respectively total solids at 53.0, 55.6, 42.4, 48.8, 62.4 parts per 

 million, and solids after ignition (December 22, 1887, not determined), 34.0, 

 28.0, 22.8, 36.4 parts per million. The figures average 52.4 parts per million for 

 total solids and 30.3 parts per million for solids after ignition. It will be seen 

 that the variation in each of the two quantities from year to year and from 

 season to season is relatively small; hence we may conclude that the two 1907 

 analyses fairly represent the average nature of the Ottawa river water in modern 

 times. 



The content of calcium and magnesium of the two stages of the river, and 

 their mean have been calculated to parts per million and the results entered in 

 Table XL., which also gives, for purposes of comparison, the calcium content of 

 other rivers as well as of the Ottawa river at Sainte Anne rapids below the solid 

 block of Paleozoic limestones lying between Ottawa and Montreal. The refer- 

 ences for the original publications of these latter analyses may be found on page 

 60 of Bulletin number 330 of the United States Geological Survey: — 



