EXPERIMENTAL EVOLUTION, VARIATION, 

 AND HEREDITY. * 



No. 23. (Paper No. 1, Station for Experimental Evolution.) 

 CASTLE, W. E. Heredity of Coat Characters in Guinea-pigs and Rabbits. Octavo, 

 78 pages, 6 plates, 8 figs. Published 1905. (In cloth.) Price $1.00. 

 This work gives the results of the author's experiments from their beginning in 

 1900 until the middle of the year 1904. The fundamental colors and the color pat- 

 terns of guinea-pigs are for the first time analyzed; the existence of latent char- 

 acters (factors, of the present time) is discovered and a case of blending character 

 (lop-earedness in rabbits) examined. The recessiveness of albinism, of smooth 

 coat, and of long coat are pointed out, and the imperfection of dominance in many 

 cases is recognized. 



No. 24. (Paper No. 2, Station for Experimental Evolution.) 

 MxcDouGAL, D. T., A. M. VAIL, G. H. SHULL, and J. K. SMALL. Mutants and 

 Hybrids of the Oenotheras. Octavo, 57 pages, 22 plates. Published 

 1905. (In cloth.) Price $1.00. 



A first study in America the home of the evening primrose of its relation- 

 ships and the inheritance of its characters. The home of Oenothera lamarckiana 

 is traced; the various native primroses are described; some of their hybrids are 

 fully worked out and the dominance of characters considered. Further evidence of 

 mutation in the evening primrose in new soil was forthcoming. The paper con- 

 cludes with a statistical comparison by Dr. Shull of Oenothera lamarckiana with 

 nanella and rubrinerzns. The variation polygons in stature of lamarckiana and 

 nanella are shown to be discontinuous, as are also those of the number of branches 

 of lamarckiana and rubrinervis. 



No. 30. (Paper No. 3, Station for Experimental Evolution.) 

 SHULL, G. H. Stages in the Development of Slum cicutcz folium. Octavo, 28 



pages, 7 plates, 11 text figures. Published 1905. Price $0.25. 

 The hemlock or water-parsnip (Sium cicut&folium) presents during develop- 

 ment a great range of leaf form. The theory that the forms which develop earliest 

 are ancestral is not supported by the evidence, and the conclusion is reached that the 

 interpretation of the various forms must be physiological rather than phylogenetic. 



No. 48. (Paper No. 4, Station for Experimental Evolution.) 



TOWER, W. L. An Investigation of Evolution in Chrysomelid Beetles of the genus 

 Leptinotarsa. Octavo, x-f320 pages, 30 plates, 31 text figures. Pub- 

 lished 1906. Price $3.25. 



^ An extensive treatise on the group to which the Colorado potato beetle belongs, 

 with reference to the distribution of the species, their variations, their color phe- 

 nomena in general, and especially their chemistry, ontogeny, and experimental modi- 

 fication. The habits and instincts of these insects are discussed and an important 

 series of pedigree cultures of modified insects is described. Finally, the bearing of 

 these experimental results on the origin of species is considered at some length. 



No. 49. (Papers Nos. 5 and 6, Station for Experimental Evolution.) 



CASTLE, W. E., and ALEXANDER FORBES. Heredity of Hair-length in 

 Guinea-pigs and its Bearing on the Theory of Pure 

 Gametes. Octavo, 10 pages, 2 figs. 



CASTLE, W. E. The Origin of a Polydactylous Race of Guinea-pigs. 

 Octavo, 13 pages. 



Published 

 1906. 



Price 

 $0.25. 



The authors discuss the result of mating guinea-pigs with long and with short 

 hair respectively and conclude that long hair is recessive. However, in subsequent 

 crosses, hairs of an intermediate length arose, and this condition is believed to have 

 acted as a permanent blend of the long- and short-haired types; and the conclusion 



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