The Journal of microscopy and natural science . chcase it becomes necessary to change it; lastly, this tiresome adhe-rence may equally proceed from a cause that I attribute to anelectric current—a curious fact, but one well known to those whohave selected Diatoms. Mr. Kinker, of Amsterdam, has told methat when the north wind blew rather strongly, the effect was verysensible. I have observed the same many times. This is notalways the sole cause; but each time that an effect of this kindhas been produced, I have laid aside my selection for a morepropitious moment. When a Diatom has been chosen,
The Journal of microscopy and natural science . chcase it becomes necessary to change it; lastly, this tiresome adhe-rence may equally proceed from a cause that I attribute to anelectric current—a curious fact, but one well known to those whohave selected Diatoms. Mr. Kinker, of Amsterdam, has told methat when the north wind blew rather strongly, the effect was verysensible. I have observed the same many times. This is notalways the sole cause; but each time that an effect of this kindhas been produced, I have laid aside my selection for a morepropitious moment. When a Diatom has been chosen, it must be transferred to aslip prepared to receive it, and there fixed. For this it is needfulto use two microscopes, the second serving to centre the slipcarrying the prepared cover-glass ; but then there is some chanceof losing the object en roufe, especially if it be heavy. It istherefore better to place the two slips side by side on the stage ofthe microscope which is used for the selection, and then advancing TECHNOLOGY OF DIATOMS. 351.
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