422 INTRODUCTION TO CYTOLOGY 



Morgan, T. H., Sturtevant, A. H., Muller, H. J., and Bridges, C. B. 1915. 



The Mechanism of Mendelian Heredity. 1st ed. New York. 

 Muller, H. J. 1916. The mechanism of crossing-over. Am. Nat. 50: 193-221, 



284-305, 350-366, 421-434. figs. 13. 

 Muller, H. J. and Altenburg, E. 1919. The rate of change of hereditary factors 



in Drosophila. Proc. Soc. Exp. Biol, and Med. 17: 10-14. 

 Mulsow K. 1912. Der Chromosomenzyklus bei Ancyracanthus cystidicola Rud. 



Arch. Zellf . 9 : 63-72. pis. 5, 6. figs. 5. 

 Nabours R. K. 1919. Parthenogenesis and crossing over in the grouse locust 



Apotettix. Am. Nat. 53: 131-142. 

 Xachtsheim, H. 1912. Parthenogenese, Eireifung und Geschlechtsbestimmung bei 



der Honigbiene. Sitzber. Ges. Morph. Physiol., Miinchen. 

 1913. Cytologische Studien iiber die Geschlechtsbestimmung bei der Honigbiene 



(Apis mellifica), Arch. Zellf. 11: 169-241. pis. 7-10. 

 1919. Zytologische und experimentelle Untersuchungen iiber die Geschlechts- 

 bestimmung bei Dinophilus apatris Korch. Arch. Mikr. Anat. 93: II, 17-140. 



pis. 2-5. figs. 5. 

 Nagai, I. 1915. On the influence of nutrition upon the development of sexual organs 

 in the fern prothallia. Jour. Coll. Agr. Univ. Tokyo 6: 121-164. pi. 10. figs. 



7. 

 von Nageli, C. 1884. A Mechanico-physiological Theory of Organic Evolution. 



(Engl, transl.) (See Wilson 1900, p. 401.) 

 Nawaschin, S. 1910. Naheres liber die Bildung der Spermakerne bei Lilium Mar- 



tagon, Ann. Jard. Bot. Buit. 2: Suppl. 3, 871-904. pis. 33, 34. 

 Newman, H. H. and Patterson, J. T. 1909. A case of normal identical quadruplets 



in the nine-banded armadillo, and its bearing on the problems of identical twins 



and sex determination. Biol. Bull. 17: 181-187. figs. 3. 

 1910. The development of the nine-banded armadillo from the primitive streak 



stage to birth; with special reference to the question of specific poly embryony. 



Jour. Morph. 21: 359-424. pis. 9. figs. 15. 

 Osborn, H. F. 1917. The Origin and Evolution of Life. N. Y. (Chapter V.) 

 Parmenter, C. L. 1920. The chromosomes of parthenogenetic frogs. Jour. Gen. 



Physiol. 2 : 205-206. 

 Paulmier, F. C. 1898. Chromatin reduction in the Hemiptera. Anat. Anz. 14: 



514-520. 19 figs. 

 1899. The spermatogenesis of Anasa tristis. Jour. Morph. 15: Suppl. 223-272. 



pis. 13, 14. 

 Payne, F. 1909. Some new types of chromosome distribution and their relation 



to sex. Biol. Bull. 16: 119^166. pi. 1. figs. 12. 

 1912. The chromosomes of Gryllotalpa borealis Burm. Arch. Zellf. 9: 141-148. 



figs. 2. 

 1916. A study of the germ cells of Gryllotalpa borealis and Gryllotalpa vulgaris. 



Jour. Morph. 28: 287-327. pis. 4. figs. 5. 

 Pearl, R. and Parshley, H. M. 1914. Data on sex determination in cattle. Biol. 



Bull. 24 : 205-225. 

 Pfluger, E. 1884. Ueber die Einwirkung der Schwerkraft und anderer Bedin- 



gungen auf die Richtung der Zelltheilung. Arch. f. ges. Physiol. 34: 607-616. 

 Plough, H. H. 1917. The effect of temperature on crossing over. Jour. Exp. 



Zool. 24: 147-210. figs. 9. 

 Pritchard, F. J. 1916. Change of sex in hemp. Jour. Hered. 7: 325-329. 

 Punnett, R. C. 1913, 1917. Reduplication series in sweet peas. I, 11. Jour. Gen- 

 etics 3 : 77-104; 6 : 185-194. 

 1919. Mendelism. 5th ed. London. 



