Injury to vegetation and animal life by smelter wastes . ^$^. »f- »-?*,•« TENNESSEE SMELTERS. 13 In a similar investigation in the \ icinity of a zinc smelter atLethmathe, Germany. one especially conclusive examination wasmade of the foliage of the surrounding vegetation. The investi-gator, instead of selecting the trees in groups of two from the samelocation, one injured and the other uninjured, used injured treesfrom points near the smelter and uninjured trees for comparisonat points farther distant from the smelter, but in the same direction.(When this can be done the results are even more
Injury to vegetation and animal life by smelter wastes . ^$^. »f- »-?*,•« TENNESSEE SMELTERS. 13 In a similar investigation in the \ icinity of a zinc smelter atLethmathe, Germany. one especially conclusive examination wasmade of the foliage of the surrounding vegetation. The investi-gator, instead of selecting the trees in groups of two from the samelocation, one injured and the other uninjured, used injured treesfrom points near the smelter and uninjured trees for comparisonat points farther distant from the smelter, but in the same direction.(When this can be done the results are even more conclusive thanthose obtained by the writer b} the method just outlined, but. wn-fortunately, the rugged nature of the country in the vicinity of thesmelter at Kedding made such a procedure impracticable.) Of ninegroups of trees examined 89 per cent contained more sulphur trioxidbotli in the leaAes themselves and in the ash of the leaves of theinjured trees than in the nninjured ones. Three or four years laterthe same region around the zinc smelter w
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