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48. Ibid., xviii, 1910, p. 174. 
49. “The Chromosomes of Gryllotalpa” ‘Arch. Zellforsch.,’ 
ix, 1912, p. 141. 
50. Pearl, R., and Parshley, H. M. — “ Sex-Determination in Cattle,” 
‘ Biol. Bull.,’ xxiv, 1913, p. 205. 
51. Schleip, W. — “ Uber die Chromosomen verhilltnisse bei Angio- 
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52. Seiler, J. — “ Geschlechtschromosomen bei Lepidopteren,” ‘ Zool. 
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53. Smith, Geoffrey. — “ Studies in the Experimental Analysis of Sex,” 
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54. Steche, O. — “Die sekundaren Geschlechtscharaktere der Insekten,” 
‘ Zeitschr. f. indukt. Abstamm.,’ viii, 1912, p. 284. 
55. Stevens, N. M. — “ A Study of the Germ-cells of Certain Diptera,” 
‘ Journ. Exp. Zool.,’ v, 1908, p. 365. 
56. “ Heterochromosomes in the Guinea-pig,” ‘ Biol. Bull.,’ xx, 
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57. Sturtevant, A. H. — “ The Linear Arrangement of Six Sex-linked 
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58. Sutton, W. S. — “Morphology of Chromosome-group in Brachy- 
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59. “ The Chromosomes in Heredity,” ibid., iv, 1903, p. 231. 
60. Tennent, D. H. — “ The Chromosomes in Echinoid Eggs,” ‘ Journ. 
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61. Thomas, R. Haig. — “ Experimental Pheasant Breeding,” ‘ Proc. 
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62. Wallace, L. B. — “ Spermatogenesis of a Spider,” ‘ Biol. Bull.,’ viii, 
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63. Whitney, D. D. — “Maturation of Egg of Hydatina senta,” 
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64. Wilson, E. B. — ‘ Mendel’s Principles of Heredity and the Matura- 
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65. “Studies on Chromosomes: III,” ‘ Journ. Exper. Zool.,’ iii, 
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66. “ Studies on Chromosomes : VII,” ‘Journ. Morphol.,’ xxii, 
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67. “ Recent Researches on the Determination and Inheritance 
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