. The microscope and its revelations. Fic. 453.—SurireUa constricta : A, side view ;B, front view; C, binary subdivision. DIATOM ACE.*: 607 liculi are most developed, and it is consequently here that they mavbe best studied ; and of there being here really costce, or internallyprojecting ribs, no reasonable doubt can remain after examinationof them under the binocular microscope, especially with the black -ground illumination. The form of the valves in most of the spec-it-sis circular or nearly so; some are nearly flat, whilst in others thetwist is greater than in the species here represented.
. The microscope and its revelations. Fic. 453.—SurireUa constricta : A, side view ;B, front view; C, binary subdivision. DIATOM ACE.*: 607 liculi are most developed, and it is consequently here that they mavbe best studied ; and of there being here really costce, or internallyprojecting ribs, no reasonable doubt can remain after examinationof them under the binocular microscope, especially with the black -ground illumination. The form of the valves in most of the spec-it-sis circular or nearly so; some are nearly flat, whilst in others thetwist is greater than in the species here represented. Some of thespecies are marine, whilst others occur in fresh water; a verybeautiful form, the C. clypeus, exists in such abundance in theinfusorial stratum discovered by Ehrenberg at Soos, near Ezer. inBohemia, that the earth seems almost entirely composed of it. The next family, the /Striatellece, forms a very distinct group,differentiated from every other by having longitudinal costse on theconnecting portions of the frustules, t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
