534 John Casper Branner • ■ 



Taking the observations for the entire year under considera- 

 tion, the matter in solution is equal to about .31 of that in 

 suspension, or a little more than one-fourth of the total 

 amount removed. These relations, however, are not constant, 

 as may be seen by a comparison of the totals in suspension 

 and solution during the individual months or on individual 

 days. In November, 1887, for example, the dissolved matter 

 was greatly in excess of the suspended matter — more than six 

 times as much— while on Oct. 13th, 1891, the suspended mat- 

 ter was more than thirteen times the matter in solution. 



Attention is called to the larger percentage of silica in the 

 water in times of freshets ; 1.83 of the total at low water, and 

 1 1. 8 1 of the total at high water.* The water at low gage read- 

 ings is all spring water, or water that has passed through the 

 rocks or soils instead of over them, while that at high readings 

 is chieily surface water. It seems probable, therefore, that the 

 silica exposed over the surface of the ground is rendered more 

 soluble by its exposure to weathering influences and to the 

 organic acids of decaying organic matter, than is that of the 

 unexposed rocks through and over which underground waters 

 pass. 



The Results. — The following tables are based upon gage 

 readings for every day of the year, a complete set of velocitj' 

 and discharge observations made and comprehensive samples 

 of water collected on 32 days. From these observations inter- 

 polations were made to complete the table. The results of 

 two independent sets of interpolations agree closely. 



*Inasmuch as only one pair of analj'ses was made to determine this 

 point it is possible that a generalization on this subject is not to be 

 trusted, in any case it is desirable that other observations be made on 

 this subject. 



