508 THE JOURNAL OF GEOLOGY. 



stages, and the analyses of our great rivers are incomplete, but, 

 strange as it seems, no other analyses of their waters have 

 been found, after diligent search. 



SAMPLES. 



[a) Ottawa river; sampled March 9, 1854, before the melting 

 of the snow, at head of St. Anne lock ; water was pale amber yel- 

 low, free from sediment and derived from a region of crystalline 

 rocks covered with forest and marsh vegetation. 1 



(d) St. Lawrence river, sampled March 30, 1854, before the 

 melting of the snow, on the south side of the Pointe des Cas- 

 cades, Vaudreuil ; water was clear, colorless, and represents the 

 drainage of areas of glacial drift, crystalline rocks and paleozoic 

 sediments, clarified by passage through great lakes. 1 



(c) Mississippi river;* sampled in the autumn of 1887 at very 

 low water, in the main channel above the mouth of the Missouri; 

 water represents drainage from areas of glacial drift, crystalline 

 rocks and paleozoic sediments, including large expanse of lime- 

 stone and cultivated lands. 



(#f) Missouri river;* sampled on the same day as the preced- 

 ing ; water represents drainage most highly charged with the sol- 

 uble salts of the more recent and little consolidated geologic for- 

 mations; potash was no doubt present but was not determined. 



(<?) Mississippi river;* six miles below the mouth of the Mis- 

 souri ; sampled on the same day as the preceding in the current 

 of Mississippi water as shown by a float dropped on taking sam- 

 ple c ; sample represents Mississippi and Missouri waters, appar- 

 ently with excess of the latter. 



(/) Mississippi river ;* twelve miles below the mouth of the 

 Missouri, above St. Louis ; sampled on the same day as the pre- 

 ceding in the current indicated by the float ; sample represents 

 Mississippi and Missouri waters apparently more thoroughly 

 mixed. 



1 Geology of Canada, 1843-63, Logan, pp. 565-568. 



*Annual Report of the Water Commissioner, St. Louis, 18S8, pp. 309-310. Anal- 

 yses by St. Louis Sampling and Testing Works, Wm. B. Potter, Manager. 



