LLUSTRATIONS. 



PLATES. 



Page. 



Plate I. Keswick smelter near Redding, Cal., in operation 8 



II. Fumigation chamber for testing effects of sulphur dioxid on young 



trees 12 



III . View about 2 miles south of Keswick smelter near Redding, Cal 14 



IV. View about 3 miles west of Keswick smelter near Redding, Cal 14 



V. Washoe smelter at Anaconda, Mont., in operation 22 



VI. Map of region around Anaconda, Mont, (folder) 22 



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 apparently 



uninjured 24 



VIII. Fig. 1. — View of a mountain side about 10^ miles west from Washoe 

 smelter — red firs killed and lodgepole pines injured. Fig. 2. — View 



of mountains about 11 miles west from Washoe smelter 24 



IX. Fig. 1. — Uninjured mountain side about 2 miles south of divide 

 and 10 miles south of smelter beyond range of apparent damage. 

 Fig. 2. — Uninjured mountain side up Dry Cottonwood Creek be- 

 yond ranger's cabin, about 14 miles ENE of smelter, beyond 



range of apparent damage 38 







