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California standard American woods, beech, birch and maple. Four species give alcohol yields of more than 2 per cent based on the dry weight of the wood, but the highest acid yield from any of these three is only 4.94 per cent. This is also the highest acid yield from any of the 46 species. The distillations and analyses were carried on in much the same way as those recorded in Table 7 so that the results should be comparable.

Table 8 shows the yields of pyroligneous acid, charcoal and tar from the same distillations recorded in Table 7. These figures are not of so much importance and can not be compared so accurately on account of the fact that they may be made to vary to a certain extent by the maximum temperature to which the charge is carried. For instance, a slightly higher final temperature will certainly decrease the yield of charcoal and possibly increase the yield of tar. The pyroligneous acid figures do not vary widely and seem to have no particular significance, but there is a certain amount of relationship between the tar and charcoal values and those for wood alcohol given in Table 7. This relationship is brought out in Table 9 in which are arranged most13> of the species of Tables 7 snd 8 in order of the alcohol yields. The tar and charcoal figures are seen to arrange themselves in some semblance of order, the tar values decreasing with decreasing alcohol and the charcoal values increasing in the same direction. . Especially noticeable are the high charcoal values for the oaks, chestnut and eucalyptus and the low alcohol and tar values for chestnut. It is not known how much significance these figures may have, but it is possible that more accurate and complete determinations would give more regularity in this arrangement and develop more definite conclusions.

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