Document wqRoJVrzexpwEm7a9LZzzEB7o

? !*:. . f * Industrial Hygiene Digest - 13 August, 1949 However, great care should be taken to exclude the tuberculous in select ing persons to receive aluminum therapy. (4) It Is not believed that a scientifically controlled experiment In Industry Is feasible for the evaluation of aluminum for the prophylaxis of silicosis. Ihls follows from the uncontrollable variables Inherent In the Industrial situation and other factors which have been discussed. For these reasons, It appears Improbable that any research agency would consider It advisable to under take such a project except under special conditions already discussed, and which may not be attainable. (?) The McIntyre Research Foundation, as presently organized, Is not equipped to solve the aluminum prophylaxis problem In relation to silicosis. The steps considered necessary to accom plish this objective are outlined. (6) Research should be continued vlth laboratory animals vlth the object of finding a more adequate basis for application to man. Such study Is now Included In the program of the Saranac Laboratory of the Trudeau Foundation. - Authors* Summary 866 Effects of Electricity on the Human Body. W.B. Kouwenhoven. Ind. Med. lB, 269 (July, W). The author discusses briefly the various effects of electricity on the body. Including variations vlth the amount of current. The current values of Interest are: (l) threshold of feeling, about 1 mllllampere; (2) let-go current, above vhlcb It Is difficult to let go of a wire, about 9 milllamperes for men, 6 for women; (?) current producing ventri cular fibrillation, 0.1 ampere; (U) current producing a block In the ner vous system, one ampere or more; and (?) the counter shock current. The last three result In death If prolonged; otherwise artificial respiration may save the victim. These effects refer to alternating current of com mercial frequency. Direct current Is much less harmful. The only effect of high-frequency currents,,1b heating. 867 Asbestos la and Cancer of the Lung. Editorial. J.A.M.A. l4o. 1219-1220 (Aug. 13. 1949). Records of English, American and German physicians and The Annual Report of the Chief Inspector of Factories In England for 1947 shov that the occurrence of cancer of the lung Is related to pulmonary asbestosls. This relation Is supported by the following observations: (1) The Incidence rate of cancer of the lungs In asbestosls patients Is 10 to 1? times as high as among the general population.(2) The male-female ratio Is more nearly equal than It Is for the general population, which Indicates that an environmental and evidently occupational carcinogen tended to equalize the Incidence rate of cancer of the lungs for both sexes. Recent experi mental observations support this Interpretation of clinical evidence. 888 Changes In the Lungs Produced by Natural Graphite. H.E. Herdin'- ?.-l O.B. Oliver. Brit. J. Ind. Med. 6, 91-99 (April, 151*9). A brief description Is given of the Industrial uses of natural graphite, which Is a crystalline carbon mixed vlth up to 10$ of free silica and vlth other minerals. The greatest dust risk occurs In the grinding of natural graphite, for which evidence is presented to Bhov that this can lead to