File:The microscope and its revelations (1901) (14764795694).jpg

Identifier: microscopeitsrev00carp (find matches)
Title: The microscope and its revelations
Year: 1901 (1900s)
Authors: Carpenter, William Benjamin, 1813-1885 Dallinger, W. H. (William Henry), 1842-1909
Subjects: Microscopy Microscopes Natural history
Publisher: Philadelphia, P. Blackiston's Sons and Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image:
Fie;. 443.—Aroolutions inIxfhmia iierrosa. diatom-resolvers, who d< PLATE X.
Text Appearing After Image:
PLEUROSIGMA ANGULATUM. Magnified 4900 diams. From a Photo-Micrograph by Dr. R. Zeiss taken with the 2 mm. Apocnromatic ObjectiveN. A. 1.30 and projection eyepiece 4. Collotype Ptg. Co., 2*2 High Hoi born, W.C. DIATOMACE.E 593 to leave no doubt as to the details of its structure. If we closelyexamine the photographic image of a portion of P. angulatum, pro-duced under a magnification of 4,300 diameters, and shown in PlateX, taken from a photograph by Dr. Zeiss, it will, in the majority ofcases, leave perhaps little doubt that the valves are covered by thebeads or apertures in a decussate arrangement. We have, in thejudgment of Count Castracane, to do here with beads and not with cavities. But. from the recent advances of our knowledge, this by nomeans follows; they may with high probability be considered per-forations in the silex of the frustule. This is, indeed, placed almostin the form of a demonstration by the interesting fact that Mr. C.Haughtoii Gill succeeded in filling up the d

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