CONT ENS: 
Introduction Us Sok ee Se ee es ee ee ee ee ee 
Processiof extracting metals iromcores.ese. = aaa ee ee 
Resultant: wastes. 2.22 (ous Seas eee an eye eee ee ieee 
Experimental investigations relating to the action of sulphur dioxid on vege- 
CablOn ees Meee ih ee Si ear coerce So une Be lS eRe, Sena? Sith eon we 
Organs of plants through which injury takes place 
Amount’oi ‘sulphur dioxid that may causeinjurya:- 2.2. 22-22 ee 
Sulphur trioxid content of the foliage of fumigated and unfumigated 
Polambs:. SF Se Ree Se Na ga aa ce ee ce 
Field investigations of the action of sulphur dioxid fumes on vegetation... -.- 
A California smelter and certain foreign smelters.....................-.-. 
Two. Pennéssee smelters: >. 2.2 sh ee ee ee 
Investigations of Injury to vegetation and animal life by smelter wastes around 
AMACON May NOMibies = eae el eas ee ee GN ae er 
Location of smelters and appearance of surrounding vegetation.......... 
Sulphur trioxid in foliage of trees around Washoe smelter..........-.-- 
Injury to cattle by arsenic in the vicinity of the Washoe smelter.......- 
Injury to crops and soil by tailings and slag from the Washoe reduction 
| OUE2N ON GE Ra ao ag a a ee ce ae oa ee Eee ee Bo: gaps esac res see 
Methods etsanalysisiused in imyvestigablonsssa sos ee 6 ee eee 
Holiagerot trees is ose Si ee RST aie es ne eae ee Sh ee ey 
a 
SOUS yep SS Uo cos Se A oe eh wee ee Os co 2 ee ee ee 
Wiaberse cays Sec en ae EAS SRD eek oe it ay apne ey ae a 
Cattle-foodimaterials.- ees Sets Oe ee eee 
Orese ee. sau ss eee eee OE oe cee te te taetc RR ees See ere eee 
LU Ssah RACE CO IN se 
PLATES. 
PLATE I. Keswick smelter near Redding, Cal., in operation....-...------ 
II. Fumigation chamber for testing effects of sulphur dioxid on 
VOUNG tre@S2 2224 SS ce ee ais ta ee 5 ee ee ee eee 
III. View about 2 miles south of Keswick smelter near Redding, Cal. - 
IV. View about 3 miles west of Keswick smelter near Redding, Cal. - 
V. Washoe smelter at Anaconda, Mont., in operation..---.-.------ 
VI. Map of region around Anaconda, Mont. (folder) ..---......-.-- 
VII. Fig. 1.—View of a mountain side about 2} miles west of Washoe 
smelter—formerly covered with timber toward the summit, 
but now bare. Fig. 2.—View of a mountain side about 3 miles 
west from.Washoe smelter—red firs killed and junipers appar- 
ently uninjured: .2 fies s2c025s shah soe a ee eee ree ae 
VIII. Fig. 1.—View of a mountain side about 103 miles west from 
Washoe smelter—red firs killed and lodgepole pines injured. 
Fig. 2.—View of mountains about 11 miles west from Washoe 
Smelter’... o:5- Se this. eso es seeee ore ae eee 
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