Thanks WDF for writing so soon after his misfortunes, and again expresses sympathy.
Thanks WDF for writing so soon after his misfortunes, and again expresses sympathy.
Sends thanks for recent specimen, which gave him conclusive evidence that Verruca acts only on calcareous rocks.
Asks for a reference on carbonic acid.
Is glad CSB progresses in research on spider-like Crustacea.
Thanks correspondent for forwarding microscopical specimens, a present from C. G. Ehrenberg.
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