Journal of experimental zoology . m. Thereis an accessory chromosome, according to H. E. Jordan (13). (6) Material and method. Obtained at Chicago, Illinois,July, 1913; motile; killed in Gilsons fluid; diagram of sperm-head in figure 10 n; measurements were made to tenths of anocular division, one division being equal to ;u in set A in set B. (c) Data. Set A; figure 41 gives the distribution for 606sperm-head lengths. The curve is bimodal with modes at , giving a ratio of Set B, figure 42, givesthe frequency distribution of areas of the flat surface of
Journal of experimental zoology . m. Thereis an accessory chromosome, according to H. E. Jordan (13). (6) Material and method. Obtained at Chicago, Illinois,July, 1913; motile; killed in Gilsons fluid; diagram of sperm-head in figure 10 n; measurements were made to tenths of anocular division, one division being equal to ;u in set A in set B. (c) Data. Set A; figure 41 gives the distribution for 606sperm-head lengths. The curve is bimodal with modes at , giving a ratio of Set B, figure 42, givesthe frequency distribution of areas of the flat surface of thesperm-heads. 502 individuals were measured for length andwidth. The areal ratios were obtained by multiplying for eachindividual case the length by the width. Plotting these pseudo-areas the distributions shown in the figure are obtained. Theresult indicates that the population consists of more than onegroup. Four modal points are present, but the explanation ofthis condition is not at hand. 232 CHARLES ZELENY AND E. C. FAUST. ifi tfi lii lO ^n Fig. 40 Ovis aries; frequency distribution of head-lengths of 498 spermatozoafrom a single testis. Valueinp Frequency 1 5 12 57 28 13 83
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
