. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Cells of Developement with Spermatozoa of the House Sparrow. regularity, which they subsequently attain. The presence of the spermatozoa can only be proved with certainty, when they have become free, after the dissolution of their formative cells, the mother cyst still continuing to en- circle them. Thus we may also explain the former conjecture of one of us, R. Wagner, who thought that the spermatozoa of the singing birds had their origin immediately in the interior of the large cysts. The spermatozoa of the singing bir
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Cells of Developement with Spermatozoa of the House Sparrow. regularity, which they subsequently attain. The presence of the spermatozoa can only be proved with certainty, when they have become free, after the dissolution of their formative cells, the mother cyst still continuing to en- circle them. Thus we may also explain the former conjecture of one of us, R. Wagner, who thought that the spermatozoa of the singing birds had their origin immediately in the interior of the large cysts. The spermatozoa of the singing birds do not however lie together irregularly in the inte- rior of these cysts, as in the cock, the pigeon, &c.,but are associated in very definite fascicles, as already described. We are ignorant as to the cause of this arrangement. The number and grouping of the cells of developement in the interior of the cysts do not present any remarkable differences from those in the cock, &c., although the spermatozoa of the latter are constantly devoid of such a regular arrangement. The spermatozoa of the sing- ing birds likewise remain enclosed for some time by the membrane of the mother cysts. At the commencement they lie \\ith re- verted tails close to the interior wall of the cysts, which then assumes an oval form (Jig. 335.). Subsequently the tail ends of Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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