Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 229
study and research, axial illumi-nation is generally preferable. Asin regard to the qualities of Objec-tives (§ 55), so in respect to Illumi-nation, may it be confidently as-serted that the solution of the mostdifficult Biological problems towhich the Microscope has been yet „ , p . applied, has… … ARRANGEMENT FOR OPAQUE OBJECTS. 175 markings on Diatoni-valves or the lines on Roberts test-plate; andthat, conversely, the arrangements specially effective for the resolu-tion of the most difficult lined tests, have not, as yet, been shownto have much value in Biological investigation (§ 158).…
Microscopy · Biology
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