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Photosynthesis cannot be totally explained by chemical, hence molecular, phenomena, which have not been completely explored. There are indeed phenomena at the atomic level, such as variations in isotopic composition. However, we should consider the possibility of subatomic phenomena. These may be direct or indirect mechanism. I am inclined to say indirect and they work through the unquestionable and selective action of specific enzymes, growth hormones and other hormones. These compounds may contribute to the transmutations which were clearly shown in the course of the experiments. Nothing is simple. Results obtained with one plant cannot be extrapolated and applied to all plants. Failure will result if this point is not kept in mind. Each experiment should be performed according to a well defined procedure. In this field innovation may lead to poor results. Even a simple question of lighting, of inappropriate spectrum, may make the difference between positive and negative results. This is essentially the point I am trying to make.