Journal of experimental zoology . 3C O ^ 00 OC 30 00 OO Ci Ci Fio;. 31 ]\IelanopIus femur-rubrum; frequency distribution of head-lengthsof 491 spermatozoa from a single testis. Value in /iFrequency 72 2 ? 4 1 11 7 W 23 28 26 37 48 38 32 48 33 30 17 13 17 16 7 72236342 1 2 1 B, figure 33; 1008 spermatozoa from the same left testis as figure32. The principal modes are at and , giving a ratioof : Set C, figure 34; 73
Journal of experimental zoology . 3C O ^ 00 OC 30 00 OO Ci Ci Fio;. 31 ]\IelanopIus femur-rubrum; frequency distribution of head-lengthsof 491 spermatozoa from a single testis. Value in /iFrequency 72 2 ? 4 1 11 7 W 23 28 26 37 48 38 32 48 33 30 17 13 17 16 7 72236342 1 2 1 B, figure 33; 1008 spermatozoa from the same left testis as figure32. The principal modes are at and , giving a ratioof : Set C, figure 34; 734 spermatozoa from the sameleft testis as figures 32 and 33. The principal modes are at ,uand , giving a ratio of : (d) Conclusion. There is considerable irregularity in thecurves but a distinct tendency to bimodal arrangement. Thereis some question as to interpretation. It is evident that the. 00 CO QO 00 00 CO Fig. 32 Melanoplus differentialis; frequency distribution of head-lengths of481 spermatozoa from left testis. Value in ji Frequency 3 1 3 6 7 3 7 5 12 18 22 23 21 34 42 55 41 22 38 32 26 20 13 0 8 7 2 2 0 1 I
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
