Archive image from page 113 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 [100] OVUM. g enus was not entirely homogeneous, but was marked through its thickness with fine lines set perpendicularly to the surface. Vogt observed a similar structure, and described it more fully in the Salmonidae. More recently attention has been particularly called to it by the fuller description of the structure of the egg cover- ings in the Perca fluviatilis by Professor Miiller of Berlin. In this fish Miiller described the radiated lines as produced
Archive image from page 113 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 [100] OVUM. g enus was not entirely homogeneous, but was marked through its thickness with fine lines set perpendicularly to the surface. Vogt observed a similar structure, and described it more fully in the Salmonidae. More recently attention has been particularly called to it by the fuller description of the structure of the egg cover- ings in the Perca fluviatilis by Professor Miiller of Berlin. In this fish Miiller described the radiated lines as produced by fine tubes which pierce the whole thickness of the ex- ternal membrane, beginning with cup or funnel- shaped dilatations on the exterior, preserving a nearly equal diameter throughout, and ter- minating on the inner The tubes have a slight spiral winding as they pass through. That they are really hollow tubes Miiller ascertained by finding that he was able to press portions of the coloured oily contents of the yolk through them. Miiller farther ob- served, that in the perch each tube is set in a small prism, which terminates by a hexagonal end on the outer surface. According to Dr. Fig. 67 . Part of the ovarian ovum of the Salmon. Semi-diagrammatic view of the section of a por- tion of the yolk, porous membrane and external layer of cells iu an ovarian ovum of the salmon of 3o' in diameter, a, portion of the yolk substance showing the various granules, granular and nu- cleated corpuscles, and oil globules composing it; h, section of the porous or dotted external mem- brane ; c, portion of the outer surface of the same turned towards the observer so as to show the punctated or dotted marking produced by the ex- ternal apertures of the fine canals which run through the membrane; d, the flat surfaces of the nucleated cells (epithelial or granular) which line the ovi- capsule, between which and h they are seen edge- ways lying close along the outer surface of the
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