Matthew Carey Lea

Quotes

• “At no time has the subject of the influences of chemical agents on plants received so much intelligent attention as at present, and the labors of , , , , and many others, are daily adding to our stock of knowledge and developing new and interesting facts. The studies of these s have, however, been directed almost entirely to the effects of the absence or presence in greater or less proportion in the soil of those s and s which are there commonly found.”
• “Much difference of opinion has long existed in respect to the explanation of certain . In the vast majority of cases the action of light is a reducing one. s of iron, of uranium, and of other metals are reduced from a higher to a lower stage of oxydation, and the same is the case with the combinations of certain metallic s, such as bichromates and s. These phenomena present no difficulty. It is only when we come to the silver haloids that obscurity commences.”

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