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-16- depending on a single blood count in studying an industrial hazard. But if an abnormal count is encountered the subject should be examined at repeated inter- vals. We examined some of the girls two or throe times, and cases where we had found a white count around 6000 on the first examination an increase to around the average forithe group was noted in the succeeding examinations. We also xamined the blood of our animals at regular intervals during our experiments and could not detect any changes that did not appear in the normal animals. A histological examination of the jaws of the exposed animal did not show any change. Here again we must emphsize the fact that we realize that six months exposure is too short a time to expect any noticeable changes from an exposure to these minute quantities of radio-active salts. On the other hand x-ray pictures taken of the jaws of girls exposed a number of years to the material did not indicate any tissue changes and as we have stated their gums and muoous membrane of the oral cavity were all in excellent shape. Dr. R.C. Williams(4) has adopted 7500 W.B.C. with plus or minus ten percent as his normal for the rad ium workers at the Bureau of Mines. This is, of course, the mean of 5000 to 10000 which is taken as the usual normal limits for all conditions of nutrition. From the faots that we have presented one would feel justified in arriving at the conclusion that an industrial hazard did not exist in the luminous dial painting if it were not for the deaths in Orange. Two of the girls in England seem to give a slight indication of some exposure. Statistically also the evidence is against the assumption that suoh a hasard existed. If it were not so we would have every reason to expect to regeive reports of other cases among the four or five thousand girls who have been engaged in this work in Europe and this country. Furthermore cases should have made their appearances in other factories besides the Orange Plant inasmuch as these other girls have used the same material and have worked as long in the industry.

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    "ocrText": "-16-\ndepending on a single blood count in studying an industrial hazard. But if an\nabnormal count is encountered the subject should be examined at repeated inter-\nvals. We examined some of the girls two or throe times, and cases where we had\nfound a white count around 6000 on the first examination an increase to around\nthe average forithe group was noted in the succeeding examinations.\nWe also xamined the blood of our animals at regular intervals during\nour experiments and could not detect any changes that did not appear in the\nnormal animals. A histological examination of the jaws of the exposed animal\ndid not show any change. Here again we must emphsize the fact that we realize\nthat six months exposure is too short a time to expect any noticeable changes\nfrom an exposure to these minute quantities of radio-active salts. On the other\nhand x-ray pictures taken of the jaws of girls exposed a number of years to the\nmaterial did not indicate any tissue changes and as we have stated their gums\nand muoous membrane of the oral cavity were all in excellent shape. Dr. R.C.\nWilliams(4) has adopted 7500 W.B.C. with plus or minus ten percent as his normal\nfor the rad ium workers at the Bureau of Mines. This is, of course, the mean of\n5000 to 10000 which is taken as the usual normal limits for all conditions of\nnutrition.\nFrom the faots that we have presented one would feel justified in\narriving at the conclusion that an industrial hazard did not exist in the luminous\ndial painting if it were not for the deaths in Orange. Two of the girls in England\nseem to give a slight indication of some exposure. Statistically also the\nevidence is against the assumption that suoh a hasard existed. If it were not\nso we would have every reason to expect to regeive reports of other cases among\nthe four or five thousand girls who have been engaged in this work in Europe and\nthis country. Furthermore cases should have made their appearances in other\nfactories besides the Orange Plant inasmuch as these other girls have used the\nsame material and have worked as long in the industry."
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