. The book of photography; practical, theoretical and applied. Pig. 720.— Tiir. 721.—Self-centking Tuent.\ble. into the exact centre ; it will be seen thatthis is of importance for the formation of aperfect circle of enamel. Mounting Anatomical Specimens, Insects, ETC. Anatomical specimens are made eitherby dissection or by section. For dissec-tion manj^ instruments, such as knives andneedles of various kinds, are used, andfrequently parts of the structures aremade more prominent hy injecting colouredliquids—for instance, carmine—into blood-vessels. For section the tissue is har-den
. The book of photography; practical, theoretical and applied. Pig. 720.— Tiir. 721.—Self-centking Tuent.\ble. into the exact centre ; it will be seen thatthis is of importance for the formation of aperfect circle of enamel. Mounting Anatomical Specimens, Insects, ETC. Anatomical specimens are made eitherby dissection or by section. For dissec-tion manj^ instruments, such as knives andneedles of various kinds, are used, andfrequently parts of the structures aremade more prominent hy injecting colouredliquids—for instance, carmine—into blood-vessels. For section the tissue is har-dened by immersion in alcohol or chromicacid, etc. ; it is then either frozen hardor imbedded in paraffin wax, and ex-tremely thin sections cut by a micro-tome —an extremely useful appliance—of which there are many forms (Fig. 722).Insects are usually softened by immersionin caustic potash solution ; they are thensoaked in alcohol, followed by turpentine. fluids. Glycerine jelly is made accordingto Lawrences formula from: Gelatine,1 oz. ; glycerine,
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