54 INJURY BY SMELTER WASTES. 
TaBLeE XIII.—Sulphur trioxid in foliage, in ash, and in soils around Washoe smelter; 
nearly all samples taken from National Forest or public domain—Continued. 
WEST OF SMELTER—Continued. 
Sulphur trioxid— 
Serial eee - Location and approximate | Ashin 
No. | Description of sample. distances frou neler leaves. 
Inleaves.| Inash. | In soil. 
| 
Per cent. | Per cent. | Per cent. | Per cent. 
6358 | Foliage, injured red | Sec. 23, T.5N., R.138W., Na- 4.48 1.13 29 2 2c) Se eens 
fir. tional Forest, Weigle Hill, 
about 15 miles WNW of 
smelter. 
6300 | Foliage, uninjured red | Georgetown Flats, about 18 4.79 - 86 aT GANS (a Ce eye 
fir. or 19 miles WN W of smelt- 
er, Seemingly beyond range 
of fume injury. 
6567, |) Soil bemeathy GSa8 sa ae a chs Pe IE sie Sag Rye | dg eg 0.02 
6548 | Soil beneath 6300... -_. Sven ee nk Nee ere SRE AG Noe Crt. Serene) eeammmeietn eS irr erat] . 03 
6359 | Foliage, injured red | Sec. 23, T.5N., R.13W., Na- 4.37 1.06 PADS Behe ee ees 
110% tional Forest, Weigle Hill, ; 
about 15 miles WNW of 
smelter. 
6300 | Foliage, uninjured red | Georgetown Flats, about 18 4.79 - 86 Deel Rome ene 
fir. or 19 miles WNW of smelt- 
er, Seemingly beyond range 
| of fume injury. 
6567 | Soil beneath 6359. ----- Lea Sel Soe Ae rape A a ae Ire itera a - 02 
6548 | Soil beneath 6300. ---.-.. Hed eee 7 est NA te epee ae  eeeeeniee ee ste etl ee oe as ic | - 03 
Of 45 comparisons of injured with uninjured trees, in every case 
the sulphur trioxid content of the injured tree was larger than that 
of the individual uninjured trees, and also exceeded the averages for 
the uninjured trees of the same species situated beyond the range 
of apparent damage. In every case also the sulphur trioxid content 
of the ash of injured trees was greater than that of the ash of unin- 
jured trees situated beyond the range of apparent damage, both in 
individual cases and when average data for the uninjured trees was 
compared with individual data for injured trees 
In a northerly direction, in 100 per cent of the cases examined, 
both the leaves and ash of the injured trees contained a larger per- 
centage of sulphur trioxid than the leaves and ash of uninjured trees, 
both as regards individual and average data. 
In an easterly direction a trip was not made far enough from both 
the Anaconda and Butte smelters to be absolutely sure that the 
limit of injury had been reached. Hence the injured trees in an 
easterly direction were compared with the average figures for unin- 
jured trees of the same species taken north, south, and west of the 
smelter beyond the range of apparent injury. In 100 per cent of 
the cases examined both the leaves and ash of the injured trees con- 
tained a larger per cent of sulphur trioxid than the leaves and ash 
of the uninjured trees. This was true not only for the average of 
four uninjured trees situated north, south, and west of the smelter, 
but also in the individual cases. 
