Holland Claims the Microscope.
To the Editor:
—Allow me to call your attention to an error in The Journal of September 14th, which mistake I have recently seen in one or more other journals. On page 385 of The Journal, under the caption of "The Tercentennial of the Microscope," you ascribe the invention of that highly useful instrument to a Zacharias Janssen, of Magdeburg, the capital of a Prussian province, Saxony. Zacharias Janssen, to whom belongs the credit of constructing...