EFFECTS OF MIXING DIVERSE ORGANISMS 28 1 



when "hybrid vigor" results from the crossing of certain 

 races. On the other hand some of the combinations may be 

 disadvantageous.^^ See Chapter XII for an account of the 

 general principles underlying such results. 



NOTES AND REFERENCES ON CHAPTER XI 



1. Page 266. J. Loeb (1903), The Fertilization of the Egg of the 

 Sea Urchin by the Sperm of the Starfish. Univ. of California Publica- 

 tions, Physiology, vol. l, pp. 39-53. Also (1913), Artificial Partheno- 

 genesis and Fertilization. 312 pages. 



2. Page 267. H. Kupelwieser (1909), Entwicklungserregung bet 

 Seeigeleiern durch Molluskensperma. Archiv fiir Entwicklungsmech- 

 anik, Bd. 27, pp. 434-462. Also (1912), Weitere JJntersuchungen 

 liber Entwicklungserregung durch Stammfremde Spermien, insbeson- 

 dere iiber die Befruchtung der Seeigeleier durch Wurmsperma. Archiv 

 fiir Zellforschung, Bd. 8, pp. 352-395. 



3. Page 269. See E. Godlewski (1906), Untersuchungen iiber die 

 Bastardierung der Echinoiden- und Crinoidenfamilie. Archiv fiir Ent- 

 wicklungsmechanik, Bd. 20, pp. 579-643. 



4. Page 269. For accounts of crossing of different genera and species 

 of sea urchins, see C. Herbst (1906 and 1909), V ererbungsstudien IV 

 and VI. Archiv fiir Entwicklungsmechanik, Bd. 22, pp. 473-497, and 

 Bd. 27, pp. 266-308. Also (1925), Die Physiologic des Kernes als 

 V ererbungssubstanz. Handbuch der normalen und pathologischen 

 Physiologie, pp. 991-1039. 



Also, D. H. Tennent (1910), Echinoderm Hybridization. Carn. 

 Inst. Publ. No. 132. 151 pages. 



5. Page 270. F. Baltzer (1910), Uber die Beziehung zwischen dem 

 Chromatin und der Entwicklung und Vererbungsrichtung bei Echi- 

 nodermenbastarden. Archiv fiir Zellforschung, Bd. 5, pp. 497-621. 



6. Page 273. W. J. Moenkhaus (1904), The Development of 

 Hybrids between Fundulus heteroclitus and Menidia notata with 

 Especial Reference to the Behavior of the Maternal and Paternal 

 Chromatin. Amer. Journ. of Anat. vol. 3, pp. 29-65. 



7. Page 274. See J. E. Wodsedalek (1916), Causes of Sterility in 

 the Mule. Biological Bulletin, vol. 30, pp. 1-56. 



8. Page 275. H. Federley (1927), Chromosomenverhaltnisse bei 

 Mischlingen. Supplementband I, Zeitschrift fiir Induktive Abstam- 

 mungs- und Vererbungslehre, pp. 194-222. 



9. Page 276. H. H. Newman (1908), The Process of Heredity as 



