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M. Künckel d'Herculais tells of one of these curious crustaceans which delighted the workers in the laboratory of Concarneau. The need for covering themselves experienced by these Crabs is so strong that in aquariums when their sponge is taken away they will apply to the back a fragment of wrack or of anything which comes to hand.
"And while we are speaking of the different kinds of glass we must not forget to mention the dark red ruby glass perfected in 1680 by Kunckel, the director of the Potsdam glass works, for it is a very ingenious invention. The deep color is obtained by putting a thin layer of gold between the white glass and the coating of red." "What else did the Germans make?" queried Giusippe.
Kunckel, the discoverer of phosphorus, who lived between 1630 and 1702, complained of the alchemists' habit of giving different names to the same substance, and the same name to different substances. "The sulphur of one," he says, "is not the sulphur of another, to the great injury of science. To that one replies that everyone is perfectly free to baptise his infant as he pleases. Granted.
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