Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 346
ill depend upon the N.A. ofthe illuminating cone which cun be employed with it—not theoreti-cally, but practically. On the whole, and for the purposes of pructicul biological inves-tigation, it is to the dry upochromatics that we are most indebted,and from their use we shall derive the largest… … /. 2. 5. Fig. 277. tion, which, while not strictly accurute, will curry with it no error,us a populur illustration of this importunt subject. In fig. 277, 1, 2, 3, we huve representutions, us truly us they cunbe drawn, of zones of equal light ; thut is to suy, the peripheral zonewill trunsmit un…
Microscopy
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