File:The microscope and its revelations (1901) (14580497538).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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
anagement of the light being usually requisite with freshspecimens; but the prolonged action of water (especially when itcontains a trace of iodine) or of glycerin will often bring them intodear view. The prolonged action of glycerin, moreover, will oftenshow that the boundary-lines are double, being formed by thecoalescence of two contiguous cell-walls ; and they sometimes retreatfrom each other so far I hat the hexagonal areolse become rounded.As the primary sphere approaches maturity, the large secondaryi mass, or -.oo*/>r<ii,y successive segmentations, so that we find it toconsisl of eight, sixteen, thirl \ two, sixty-four, or still morenumerous divisions, as shown in fig. -121, Nos. C>, 7, 8. Up to thisstage, at which the sphere first appears to become hollow, it isretained within the hyaline envelope of the cell within which it has PLATE VIII.
Text Appearing After Image:
T\ _ -.: .1: - West.Newrn.aTi cliromo VOLVO CINE M 555 been produced ; a similar envelope can he easily distinguished, asshown in Xo. 10, just when the segmentation has been completed,and at that stage the fiagella pass into it, but do not extend beyondit; and even in the mature Volvox it continues to form an invest-ment around the hyaline envelopes of the separate cells, as shown inthe same figure at Ko. 11. It seems to be by the adhesion of thehyaline investment of the new sphere to that of the old that thexM-ondary sphere remains for a time attached to the interior wall ofthe primary; at what exact period, or in what precise manner, theseparation between the two takes (dace has not yet been determined.At the time of the separation the developmental process has gene-rally advanced as far as the stage represented in Xo. 1. the foundationof one or more tertiary spheres being usually distinguishable in theenlargement of certain of its cells. The development and setting-free of these co

Note About Images