The Microscope Volume 12 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ... 250 gives 360 as the number of diameters which the microscope must magnify in order to show.the stria;. A lens with 2-in. ocular magnifies only 250 times. Will you arrange your apparatus as you had it in resolving A. pellucida and with your micrometer actually measure the magnification obtained and report the resu.lt? Mounting the frustule in a high refracting medium would not enable you to see any more lines than 250 to the inch." We think " Amateur" to have probably been in error about the number of his eye-piece, but shall be pleased to hear from him. And as he was praising a particular objective, we think it shows the dangers of trying to discriminate in print in favor of some particular manufacturer. This periodical does not print much of that sort of thing. All reputable manufacturers should receive from us practically the same treatment. QUERIES AND ANSWERS. 1 Questions of alt sorts relating to microscopy toil I be leceived by t/ie publisher and re/erred to Or. S. G. Shanks, 0/ Albany, N. Y., whose tepttcs wi tbegiven in thtsdefrartmeut. Hack question is numbered for future reference. 31. I have some parts of plants in glycerine, -Mater, and spirits. Please indicate the steps how I shall proceed to cut sections, bleach and stain them. What text-book is good for practical botanical sections? Soak the specimens in water to remove the glycerine, harden them in good alcohol, cut with the razor flooded with alcohol and water, bleach them (if they require it) in Labarraque's solution of chlorinated soda, or in a weak solution of chlorinated lime (two to twelve hours are required), wash in water changed several times, then soak in a pint of water containing ten drops of nitric acid, to neutralize the alkali, to alcohol, stain, wash again in w...