176 Headden — Silicic Acid in Mountain Streams. 



Analysis of Cache a la Poudre Water 



, Sample taken 150 feet above 



Headgate 







of Larimer Co. Ditch. 







Analytical 



Per 



Grs. 





Per 



Grs. 



results. 



cent. 



Imp. Gal, 



Combined. 



cent. 



Imp. Gal, 



SiO, 



20-542 



0-5341 



CaSO^ 



8-420 



0-2198 



so, 



4-951 



0-1287 



CaC03 



36-431 



0-9471 



CO, 



21-626 



0-5622 



Mgm 



10-758 



0-2797 



CI 



7-619 



0-1980 



NaCl _-. 



12-573 



0-3276 



Na,0 .- 



8-874 



0-2307 



K,SiO, 



5-391 



0-1402 



K,6 



3-286 



0-0854 



Na^SiO, 



4-342 



0-1129 



CaO.._ 



23-884 



0-6209 



Fe,03,Al,03-- 



0-894 



0-0232 



MgO 



5-147 



0-1338 



MnA--— - 



0-093 



0-0024 



Fe,0„Al,03. 



0-894 



0-0232 



Ignition 



(4-802) 



0-1248 



Bin A 



0-093 



0-0024 









Ignition 



(4-802) 



0-1248 



Sum 



83-704 











Excess of SiO, 



16-296 



0-4237 



Sum . ,. - - 

 equiv. to CI 



101-718 



1-718 



2-6443 

 0-0446 



Total.... 



100-000 



2-6005 



Total. -_ 100-000 2-5997 

 Total solids 2*6 grs. per imp. gal. 



The sample of water from Boulder Creek was taken from a 

 tap in the town of Boulder which is supplied with water taken 

 from the creek at a point where the water is perfectly repre- 

 sentative, being gathered wholly within a granitic area. The 

 analysis follows : 



Analysis of Water from Boulder Creek, Sample taken from a tap in the town 



of Boulder. 



Analytical 

 results. 



SiO, 



S()3 



CO, 



CI ._ 



Na„0 ..... 



K,0 



Li,0 



CaO 



SrO 



MgO 



FeA,Al03 



MnO 



ZnO 



Icfnition 



Per 

 cent. 



21-985 

 8-305 



17-037 

 7-425 

 6-870 

 2-720 

 trace 



23-373 

 0-165 

 4-760 

 1-098 

 0-340 

 trace 



(7-607) 



Sum 101-676 



O equiv. to CI 1-676 



Grs. 

 Imp. Gal. 

 0-6156 

 0-2325 

 0-4770 

 0-2079 

 0-1924 

 0-0762 



trace 

 0-6544 

 0-0046 

 0-1313 

 0-0307 

 0-0095 



trace 

 0-2130 



2-8451 

 0-0469 



Per 

 Combined. cent, 



CaSO^ 14-124 



CaCO, 31-317 



SrCO, . 

 MnCO„ 



0-235 

 6-143 



MgCl, 4-305 



KCl 



NaCl -- 



NaSiO, ---. 



Fe.03,Al,03._ 



MnO 



ZnO 



4-304 

 3-586 

 9-818 

 1-098 

 0-341 

 trace 



Grs. 

 Imp. Gal, 

 0-3955 

 0-8769 

 0-0066 

 0-1720 

 0-1205 

 0-1205 

 0-1004 

 0-2749 

 0-0307 

 0-0095 



Ignition (7-607) 0-2130 



Sum 



Excess of SiO„ 



82-878 

 17-144 



2-3205 



•4789 



Total 



100-022 2-7994 



Total... 100-000 2-7982 



Total solids 2-8 grs. per imp. gal. 



