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NOTES ON BOOKS TIlE BRITISH MEDICAL JOURNAL red and x-ray photography, and the differentiation of blood. Other chapters deal with the uses of the infra-red camera in botany and palaeontology, photomicrography, and such special applications as landscape photography, aerial survey, and long-distance ground photography. Infra-red radiation can also be measured by photographic means. which the author describes, and he includes two chapters on the penetration of radiation through the atmosphere.doi:10.1136/bmj.2.4116.1044 fatcat:gatdr23mufefrbg6jrkfzixgia