February, 1920] GENETICS 31 



1812 F 2 plants of many different varietal and species crosses showing that the giant habit 

 behaves as a simple Mendelian character recessive to the normal form. First generation 

 hybrids between giant and normal plants always flower naturally in the field though the num- 

 ber of leaves is greater than on homozygous normal plants. Intermediate forms have been 

 found to arise in some progenies. These intermediates behave as hybrid forms in that their 

 progeny produce a certain percentage of typical mammoth non-blossoming types.— J. //. 

 Kempton. 



217. Allard, H. A. The Mendelian behavior of aurea character in a cross between two 

 varieties of Nicotiana rustica. Amer. Nat. 53 : 234-238. May-June, 1919.— A light, yellowish 

 green type of Nicotiana rustica with white stems and midribs, resembling in these respects 

 the White Burley variety of Nicotiana tabacum, has been designated "aurea." — First gener- 

 ation plants of a cross between this aurea type and a green type of same species were all green. 

 In second generation of 25,000 plants, 24.31 per cent were of aurea type. Extracted aurea 

 plants breed true. Some extracted green plants breed true, while others again segregate into 

 green and aurea plants. Back crosses of heterozygous plants with dominant green type give 

 only green plants in first generation while back crosses between heterozygous plants and 

 recessive aurea type produce approximately equal numbers of green and aurea plants.— The 

 aurea plants are so distinct that they can be definitely classified four or five weeks after ger- 

 mination, making it possible to grow large populations. For this reason and in view of the 

 remarkably uniform Mendelian behavior author suggests that this cross is especially favorable 

 for demonstration of simple Mendelian behavior in all its phases.— J. H . Kempton. 



218. Andrews, A. Leroy. Bryological notes. IV. A new hybrid in Physcomitrium. 

 Torreya 18: 52-54. 1918.— See Bot. Absts. 2, Entry 195. 



219. Anonymous. Disease and natural selection. Jour. Heredity 9 : 374. Dec, 1918. — 

 Extracts from report of H. C. and M. A. Soloman, Mental Hygiene, Jan., 1918. Statistics 

 on syphilitic families, indicating high correlation between morality and total net offspring. 

 — Merle C. Coulter. 



220. Anonymous. Further evidence that "like marries like." Jour. Heredity 9: 378-379. 

 Dec, 1918. — Quoted from Donald M. Marvin, in the Publications of the American Statistical 

 Association: "Marriage obeys the sweeping but silent force of propinquity, which is especially 

 potent in determining mate selection." In test samples reported by the United States Cen- 

 sus, of a thousand women who married, 541 worked; of these 275 married men of the same 

 occupation. Of a thousand men more than 25 per cent married into their own occupation. 

 — H. H. Laughlin. 



221. Anonymous. Some present aspects of immigration. Jour. Heredity 10: 68-70. 

 Feb., 1919. 



222. Anonymous. Heredity of cancer. Jour. Heredity 10:89. Feb., 1919. 



223. Anonymous. Better dairying by bull associations — joint use of good sires improves 

 herds. Jour. Heredity 10: 135. Mar., 1919. 



224. Anonymous. Variation, selection and mutation in one of the protozoa. Jour. 

 Heredity 10: 143. Mar., 1919. 



225. Anonymous. Families of the first born. Jour. Heredity 10: 160. Apr., 1919. 



226. Anonymous. Develops new hybrid cowpeas. Jour. Heredity 10: 175. Apr., 1919. — 

 See Bot, Absts. 3, Entry 972. 



227. Anonymous. Inheritance of continuous and discontinuous variations. Jour. 

 Heredity 10: 191. Apr., 1919. 



