170 Inheritance and Evolution in OrtJio/dcrd I 



Prof. C. O. Whitman first suggested the problem and introduced me 

 to Dr J. L. Hancock who has given vahiable aid in the Taxonomy and 

 Natural History of the material. To these friends I am grateful for 

 invaluable assistance and encouragement. 



EXPLANATION OF PLATE VI. 



Most of the photographs are of females, the patterns of both males and females being 

 the same. The difference in sizes is not significant, being due to the scale of the 

 photographs. 



The top row represents tlie true breeding forms. The middle and lower rows repre- 

 sent eighteen of the heterozygous forms derived from crossing the pure strains. C'G, C/, 

 FVL, and EH are modified photographs, the patterns of the rest being untouched or only 

 tinted. 



BIBLIOGRAPHY. 



1. 1909. Bateson, W. '' Mendel's rrinciplcs of Heredity." Camliridgc Uni- 

 versity Press. 



2. 1907. D.^VENPOHT, C. B. " Heredity and Mendel's Law." Proceediiujs of 

 the Washington Academy of Sciences, Vol. IX. p. 179. 



3. 1910. DoNCASTER, L. " Heredity in the Light of Recent Research." Cam- 

 bridge University Press. 



4. 1902. Hancock, J. L. "The Tcttigidae of North America." Chicago. 



5. 1911. JoHANNSEN, W. " The Genotype Conception of Hcrcdity." American 

 Naturalist, Vol. XLV. No. 531. 



6. 1907. LuTZ, Frank E. "The Variation and Correlation of the Taxonomic 

 Characters of Gryllns." Carnegie Inst. Pub. 101. 



7- 1910. Montgomery, T. IL " Arc Particular Chromosomes Sex Deter- 

 minants?" Biological Bulletin, XIX. No. I, pp. 1 — 17. 



8. 1910. Tower, W. L. "The Determination of Dominance and the Modi- 

 fication of Behaviour in Alternative (Mendelian) Inheritance by Conditions 

 Surrounding or Incident ujiou the Germ Cells at Fertilization." Biological 

 Bulletin, xvill. pp. 285 — 337. 



9. 1893. Whitman, C. 0. "Tlie Inadequacy of the Cell Theory of Develop- 

 ment." Woods Hole Biological Lectures. 



