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. 1905 Excerpt: ...by melting a portion of the ground material with a hot wire, and slightly embedding the object in the melted surface; in other cases, or on cork, pins must be used. Generally the liquid in the trough will be water. Sometimes diluted alcohol is better, especially in dissecting the nervous system of insects, as the ...
Read More
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. 1905 Excerpt: ...by melting a portion of the ground material with a hot wire, and slightly embedding the object in the melted surface; in other cases, or on cork, pins must be used. Generally the liquid in the trough will be water. Sometimes diluted alcohol is better, especially in dissecting the nervous system of insects, as the alcohol hardens the tissues. Some tissues dissect best in glycerine and water. Subjects from the plant-world have to be prepared for dissection by long soaking in water to soften them; often that is not enough, and solution of caustic soda of greater or less strength is employed; but this acts very powerfully, and the progress must be carefully watched. Insects to be dissected should always be kept in fluid till wanted; diluted methylated spirit being the most generally suitable. 70. Mounting Slides.--It will best serve the purposes of this work to select from the countless methods of mounting microscopic objects, three only, most suitable for the beginner, and most widely applicable. Microscopic objects are almost universally mounted now upon glass slips 3x1 inches. Wooden slips warp, and are discarded even for opaque objects. The paper covers once used have also quite gone out, and the microscopist should employ only good flatted glass slips with ground edges. Over the objects are placed thin 'cover-glass, ' which can be had either in largish oblong pieces for large objects, or in circles and squares of various sizes. Before use, all glasses must be cleaned. For very highclass and minute work, strong solutions are often employed to do this; but for the class of objects here in view, the glass will be sufficiently cleaned with a little soap or soda, rinsing in clean water, and drying with glass-cloth, finally polishing with clean linen or a chamois...
Read Less
