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The Histology of the Common Frog by Rose B. Ankeny, 1887

The Histology of the Common Frog by Rose B. Ankeny Edgar, 1887, Page 7

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5. means of a wax ring laid round the specimen and heated. Otherwise balsam is dropped over the specimen, and the coverglass then put in place. In this study of the frog the microscopic powers employed with the 3/4, 1/5 and the two inch objectives. The magnifying powers were measured in diameters by means of a micrometer and a camera lucida, the units of the micrometer used being 20th of a millimeter [underlined] The Skin. [/underlined] Both layers of the skin of the frog are
 
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