. The microscope and its revelations. Osc icecfi and Scytonemaceee. We st. New-men cKrom VOLVOC-USTEJE 553 into the central mass of endochrome ; and they will also retreat 011the mere rupture of the hyaline investment. From these circum-stances it may be inferred that they are not enclosed in any definitemembrane. On the other hand, the connecting threads are some-times seen as double lines, which seem like tubular prolongations ofa consistent membrane, without any protoplasmic granules in their. 9 **™ FIG. 421.—Structure of Volvox globtifoi: 11 interior. It is obvious, then, that an examinati
. The microscope and its revelations. Osc icecfi and Scytonemaceee. We st. New-men cKrom VOLVOC-USTEJE 553 into the central mass of endochrome ; and they will also retreat 011the mere rupture of the hyaline investment. From these circum-stances it may be inferred that they are not enclosed in any definitemembrane. On the other hand, the connecting threads are some-times seen as double lines, which seem like tubular prolongations ofa consistent membrane, without any protoplasmic granules in their. 9 **™ FIG. 421.—Structure of Volvox globtifoi: 11 interior. It is obvious, then, that an examination of a considerablenumber of specimens, exhibiting various phases of conformation, isnecessary to demonstrate the nature of these communications; butthis may be best made out by attending to the history of theirdevelopment, which we shall now describe. The spherical body of the young Volvox (fig. 421, No. 1) is 554 MICROSCOPIC FORMS OF VEGETABLE LIFE—THALLOPHYTES composed of an aggregation of s< imewhat; \ ngula r masses of endochrome(6), separated by the interposition of hyaline substance; and thewhole seems to be enclosed in a distinctly membranous envelope,which is probably the distended hyaline investment of the originalcell, within which, as will presently appear, the entire aggregationoriginated. In the midst of the polygonal masses of endochrome,one mass («), rather larger than the rest, is seen to present acircular form ; and this, as will presently appear, is the origi
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