ae lal 
METHODS OF ANALYSIS. 57 
From these data it will be seen that arsenic was found in consid- 
erable quantities in every sample of range grass examined, and in 
most cases a large portion of the arsenic was in a water-soluble condi- 
tion. It seems hardly necessary to add that such grass as this is not 
fit for a feed for animals. 
CONCLUSIONS. 
From the investigations made in the vicinity of Anaconda during 
‘the summer of 1908 the following conclusions relative to conditions 
at that time may be drawn: 
(1) The forests around the smelter appeared from actual chemical 
analysis to be injured for at least 10 miles north of the smelter, 114 
miles east of the smelter, 94 miles south of the smelter, and 15 miles 
west of the smelter. 
(2) This injury to forests by sulphur dioxid undoubtedly extended 
to a distance of 15 to 19 miles north of the smelter, 114 to 14 miles 
east of the smelter, where damage from the Washoe smelter and the 
Butte smelters probably overlapped, 10 miles south of the smelter, 
and 18 to 19 miles west of the smelter. The damage may have 
extended even farther in certain localities, although this was not 
proved by chemical analysis. 
(3) The injury to forests in a southerly and westerly direction 
extended farther from the smelter in the summer of 1908 than in uate 
summer of 1906. 
(4) As in the previous investigations, it was noted that the junipers 
were very resistant to smelter fumes, while the red firs were very 
susceptible and were badly damaged at distances of from 18 to 19 
miles from the smelter; the lodgepole pines were damaged for at 
least 10 or 11 miles. 
(5) Large quantities of arsenic were discharged from the smelter 
and settled on the grass of government ranges at distances as great 
as 15 miles from the smelter. Such arsenical range grasses are not a 
suitable feed for cattle. 
METHODS OF ANALYSIS USED IN INVESTIGATIONS. 
FOLIAGE OF TREES. 
Moisture. 
Dry a convenient quantity (about 2 grams) of the substance in the boiling-water 
bath until the material ceases to lose weight. 
Ash.@ 
Char a convenient quantity of the substance, representing about 2 grams, at the 
lowest possible heat. Exhaust the charred mass with water, collect the insoluble 
residue on a filter, burn till the ash is white or nearly so, and then add the filtrate to 
the ash and evaporate to dryness. Heat the whole to low redness and weigh. 
@ Official and Provisional Methods of Analysis, U. S. Dept. Agr., Bureau of 
Chemistry Bul. 107, Rev. 
