. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF THE ALBINO RAT 29 4-cell stage. The material includes the oviducts of two rats, Nos. 50 and 03, killed 3 days and 1 hour after the beginning of insemination, with twelve ova in the 4-cell stage. In figure 11, there are shown two views of each of the models obtained by reconstruction after the Born method, at a magnification of 1000, of the three 4-cell stages found in the oviducts of rat No. 50. The drawing of the reconstructions do not present the conventional figures of the 4-cell stage o
. The development of the albino rat, Mus norvegicus albinus. Embryology -- Mammals; Rats. DEVELOPMENT OF THE ALBINO RAT 29 4-cell stage. The material includes the oviducts of two rats, Nos. 50 and 03, killed 3 days and 1 hour after the beginning of insemination, with twelve ova in the 4-cell stage. In figure 11, there are shown two views of each of the models obtained by reconstruction after the Born method, at a magnification of 1000, of the three 4-cell stages found in the oviducts of rat No. 50. The drawing of the reconstructions do not present the conventional figures of the 4-cell stage of the mammalian egg. In none of the twelve ova of this stage was the plane of section such as to include all of the four cells in one section. Nearly all. Fig. 12 Cross-section of right oviduct of rat No. .50, 3 days, 1 hour. X 100. This section contains two cells of a 4-cell stage of the albino rat, slightly com- pressed between the folds of the tubal mucosa. lie in a portion of the tube which presents a relatively narrow lumen, and appear as if slightly compressed between the folds of the mucosa. I am not disposed to regard this as a resultant of fixation, due to contraction at the time of fixation. In figure 12 is reproduced a cross section of the right oviduct of rat No. 50, passing through a 4-cell stage. It is evident that in shape the two cells included in the section, conform in the main to the form of the lumen, the mucosa appearing as slightly retracted to one side of the egg mass. This conformity in shape of cell mass to the form of the lumen I find quite general in my material showing segmentation stages of the albino rat, to some extent. 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 Huber, Gotthelf Carl, 1865-. Philadelphia, Pa
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