. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Mi*. II. L. Smith on a new Growing Slide for the Microscope. 335 pose the slide to be described, which appears fully to meet all requisitions; and, as it can be readily made by any tolerably expert microscopist, it will, I am certain, be considered a valu- able addition to microscopical apparatus. The whole slide, as I have constructed it, is a trifle more than jjth of an inch in thickness. It consists of two rectangular glass plates, 3x2 inches and about ir-,th. of an inch th
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Mi*. II. L. Smith on a new Growing Slide for the Microscope. 335 pose the slide to be described, which appears fully to meet all requisitions; and, as it can be readily made by any tolerably expert microscopist, it will, I am certain, be considered a valu- able addition to microscopical apparatus. The whole slide, as I have constructed it, is a trifle more than jjth of an inch in thickness. It consists of two rectangular glass plates, 3x2 inches and about ir-,th. of an inch thick, separated by thin strips of glass of the same thickness, cemented to the interior opposed faces, as shown in the figure. This closed cell, ultimately destined to be filled with water, is not of such thickness as to prevent the use of the achromatic condenser—a very important requisite. The glass I use is such as is employed for the small cheap looking-glasses, and is easily obtained. The upper plate has a small hole (a) drilled through it. This is effected by means of the or- dinary writing-diamond and the sharp edge of a broken steel brooch or small rat-tail file. A hole can be drilled through glass of this thickness in a few minutes. Oue corner of the upper glass is re- moved, as at b, and a small strip of glass cemented at c serves to prevent the thin glass cover placed over the object from sliding. Another slip of glass is cemented on the lower side of the cell at d, but not extending as far as the removed part at b. The object of this is to prevent the water in the cell from being removed by capillary attraction, in case the slide in the neighbourhood of b should be a little wetted. This strip is not, however, absolutely necessary. To use the slide, fill the space between the two plates with clean water, introduced at b by means of a pipette, and also place a drop on a to remove the air. The object being put on the top of the slide and wetted, is now to be covered w
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