. The microscope and its revelations. J-»i>-i.vrl*lo<l T • j i i i • 11 T /• t 11 r „ ducts; 3, pitted ducts with woody fibre; <•, cells large amount 01 miorma- Of the epiderm. tion; but still it cannot be considered that the characters of any tissue have been properlydetermined until it has been dissected out. Sections of some of thehardest vegetable substances, such as • vegetable ivory. the • stones of fruit, the shell of the cocoa-nut. A:c.. can scarcely be obtainedexcept by slicing and grinding : and these may be mounted either inCanada balasm or in glycerin jelly. In cases, howe

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• Image ID: 2CF6ECK
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• Dimensions: 1431 x 1746 px | 24.2 x 29.6 cm | 9.5 x 11.6 inches | 150dpi

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. The microscope and its revelations. J-»i>-i.vrl*lo<l T • j i i i • 11 T /• t 11 r „ ducts; 3, pitted ducts with woody fibre; <•, cells large amount 01 miorma- Of the epiderm. tion; but still it cannot be considered that the characters of any tissue have been properlydetermined until it has been dissected out. Sections of some of thehardest vegetable substances, such as • vegetable ivory. the • stones of fruit, the shell of the cocoa-nut. A:c.. can scarcely be obtainedexcept by slicing and grinding : and these may be mounted either inCanada balasm or in glycerin jelly. In cases, however, in which thetissues are of only moderate firmness, the section may be most readilyand effectually made with the microtome ; and there are few partsof the vegetable fabric which may not be advantageously examinedby this means, any very soft or thin portions being placed in itbetween two pieces of cork, elder-pith, or carrot. In certain cases, however, in which even this compression would be injurious, the H r < W. 7CO MICROSCOPIC STRUCTURE OF PHANEROGAMIC PLANTS sections must be made vitli a sharp knife, the substance being laid onthe nail or on a slip of glass. In dissecting the vegetable tissues, scarcely any other instrument will be found really necessary thana pair of needles (in handles), one of them ground to a cutting edge.The adhesion between the component cells, fibres, etc., is oftensufficiently weakened by a few hours maceration to allow of theirreadily coming apart, when they are torn asunder by the needle-points beneath the simple lens of a dissecting microscope. But ifthis should not prove to be the case, it is desirable to employ someother method for the sake of facilitating their isolation. None is soeffectual as the boiling of a thin slice of the substance under exami-nation either in dilute nitric acid or in a mixture of nitric acid andchlorate of potassa. This last method (which was devised bySchnit/) is the most rapid and effectual, requ