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... seven collective indices cover the periods 190 7-1 6, 191 7-2 6, 192 7-3 6, 193 7-4 6, 194 7-5 6, 195 7-6 1, 196 2-6 6 To aid in finding information in the latest issues before the semiannual indices have appeared,... that all joints be well greased in order to maintain a low pressure and avoid freezing the joints The likelihood of freezing is also great in reactions involving alkali A frozen joint can usually... Yet the same rapid expansion of knowledge in theoretical organic chemistry, in stereochemistry, in reaction mechanisms, in complex organic structures, in the application of physical methods—provides