202 GENETICS [Bot. Absts., Vol. V, 



1529. Hottes, Alfred C. Our American originators. Florists' Exchange 48: 933. S fig. 

 Dec. 27, 1919. — The work of the A. W. Livingston Seed Co., of Columbus, Ohio, is discussed 

 somewhat flatteringly and information is given as to the source or point of origin of nineteen 

 commercial varieties of potatoes. — H. F. Roberts. 



1530. Hottwink, R. Hzn. Erfelijkheid. Populaire beschouwingen omtrent net tegen- 

 woordige standpunt der erfelijkheid, versameld uit theorie en practijk. [Heredity. Popular 

 presentation of the present status of heredity compiled from theory and practice.] Assen. 

 Stoomdrukkerij Floralia 1919: 1-62. 5 pi. 1919. 



1531. Howe, Ltjcien. The relation of hereditary eye defects to genetics and eugenics. 

 Jour. Heredity 10: 379-382. Nov., 1919. 



1532. Hume, A. N. Corn families of South Dakota. South Dakota Agric. Exp. Sta. Bull. 

 186: 114-134. Aug., 1919. — A plan of corn breeding is described in which a 96-ear-row breeding 

 plot is employed. The plot is divided into four independent quarters of twenty-four rows 

 each and alternate rows are detasseled in order to insure against the most extreme forms of 

 inbreeding. Thus far the system follows that devised by the Illinois Agricultural Experiment 

 Station. An important modification, however, lies in the fact that instead of planting the 

 tasseled or "sire" rows from different individual ears, all of the twelve "sire" rows of each 

 quarter are planted from kernels of a single ear. This not only permits a more intense selec- 

 tion for high yield but also makes possible the establishment of a definite ear pedigree along 

 both lines of parentage. Data are given to show the tendency of yielding capacity of seed 

 ears to follow lines of ancestry. — L. H. Smith. 



1533. Hume, A. N. Yields from two systems of corn breeding. South Dakota Agric. 

 Exp. Sta. Bull. 184: 70-86. Jan., 1919. — Two systems of corn breeding are compared, both 

 of which are based upon the ear-row plan of continuous selection. The essential difference 

 between the two systems is that in the one, alternate rows of the breeding plot are detasseled 

 and seed is taken only from detasseled plants thereby insuring a certain degree of crossing 

 while in the other system this precaution is omitted. The results based upon several seasons' 

 data indicate no significant difference in effectiveness in increasing yield. The working details 

 of a plan of corn improvement intended to meet the demand for simplicity and practicability 

 are appended. — L. H. Smith. 



1534. Ikeno, S. Etudes d'heredite sur la reversion d'une race de Plantago major. [He- 

 reditary studies on reversion in a race of Plantago major.] Rev. Gen. Bot. 32 : 49-56. 1920. 



1535. Ireland, Alletne. Democracy and heredity — A reply. Jour. Heredity 10: 360- 

 367. Nov., 1919. 



1536. Janssens, F. A. A propos de la chiasmatype et de la theorie de Morgan. [Concern- 

 ing the chiasmatype and Morgan's theory.] Reunion Soc. Beige Biol. 1919: 917-920. 1919. 



1537. Janssens, F. A. Une formule simple exprimant de qui se passe en realite lors de la 

 "chiasmatypie" dans les deux cineses de maturation. [A simple formula expressing what really 

 takes place in chiasmatypy in the two maturation divisions.] R6union Soc. Beige Biol. 1919: 

 930-934. 1919. 



1538. Johannsen, W. Weismanns Keimplasma-Lehre. [Weismann's germplasm theory.] 

 Die Naturwiss. 6: 121-126. 1918. 



1539. Johannsen, W. Om Weismanns Kimplasma-Laere. [Weismann's germplasm the- 

 ory.] Vidensk. Meddelelser fra Dansk Naturhist. Foren i KJ0benhavn. 69: 153-164. 1918. 



1540. Johnson, Charles W. Variation of the palm weevil. Jour. Heredity 11: 84. Feb., 

 1920. 



