156 GENETICS [Bot. Absts., Vol. VI, 



1092. Kooiman, H. N. Eenige opmerkingen naar aanleiding van Lotsy's artikel "De 

 Oenotheren als kernchimaeren." [Some remarks on Lotsy's paper "The Oenotheras as nuclear 

 chimeras."] Genetica 2: 235-243. May, 1920. — Some theoretical remarks upon Lotsy's 

 paper. With Lotsy, author is of opinion, that distribution of chromosomes according to the 

 laws of chance gives a good explanation for simple Mendelism; but he does not accept the iden- 

 tification of factors, working in the same direction, as founded upon the same causes. He 

 does not accept Lotsy's disavowal of the existence of genes, nor his hypothesis of chromosome- 

 linkage. The Drosophila researches are not in accordance with this hypothesis; so for Oeno- 

 thera it cannot be admitted without very strong arguments. For that reason the writer 

 supposes that the most important characters of the Oenotheras are bound to genes, that are 

 localized in the same chromosome. A strong linkage between these genes would then probably 

 be responsible for the hereditary behavior of the Oenotheras according to Renner's researches. 

 —M. J. Sirks. 



1093. Kooiman, H. N. Overzicht over enkele Oenothera-problemen. [Review of a few 

 Oenothera-problems.] Genetica 1: 134-148. Mar., 1919.— Critical summary of the most 

 important Oenothera-papers of later years and of the problems they treat. — M. J. Sirks. 



1094. Kroon, H. M. De overerving der kleuren bij onze huisdieren, in het bijzonder by 

 het paard. [Heredity of coat-color in domesticated animals, especially in the horse.] Tijd- 

 schr. voor diergeneeskunde 47: 83-95. 1920.— See next following Entry, 1095. 



1095. Kroon, H. M. Nog eens. De overerving der kleuren bij onze huisdieren, in het 

 bijzonder bij het paard. [Color inheritance in domestic animals, especially the horse. (2).] 

 Tijdschr. voor diergeneeskunde. 47: 312-314. 1920.— Following abstract represents next 

 preceding entry (1094) as well as present one. First paper is a summary of the work done by 

 previous authors, Harper, Robertson, Wilson, Sturtevant, Anderson, Wentworth, Wal- 

 ther, Stroever, Reimers for detecting the various inheritable factors for coat-color in horses. 

 Author makes use of the nomenclature of Wentworth: C, chestnut, H, black, B, brown, G, 

 gray, D, dappling, R, roan, P, piebald, I, diluting factor, S, star, and M, mane; he indicates the 

 genotype combinations, corresponding with the various colors. — In the second paper a special 

 case, mentioned by one of his correspondents is treated along lines indicated in the first article. 

 A mare, White Mouse, gave by a dark chestnut stallion, The Rush, a white-born foal (White- 

 born is the extreme form of piebald) ; thus CCPP + CCpp = CCPp.) A second time White 

 Mouse was served by William IV, brown, and gave a piebald foal (CCPP + CCHHBB = 

 CCHhBbPp); for the third time a foal was bred from White Mouse by Le Cid, a common 

 gray (not white-born), the foal was at birth piebald, but became in the same summer wholly 

 gray (CCPP + CCHHBBGG = CCHhBbGgPp) and a fourth foal was born from White 

 Mouse by Cher Amour, a French chestnut (CCPP + ccpp = CcPp, a white-born foal). 

 The mare White Mouse seemed therefore to be homozygous for the piebald factor P.- -With 

 our knowledge of the various color factors in horses such seemingly difficult cases may find a 

 happy solution. — M. J. Sirks. 



1096. Kuiper, K., Jr. Onderzoekingen over kleur en teekening bij runderen. Naar 

 experimenten van R. Houwink Hzn. [Researches on color and markings in cattle. Based on 

 experiments by R. Houwink Hzn.] Genetica 2: 137-161. Mar., 1920.— Author tries to show 

 how the characteristic markings of the Dutch belted cattle are inherited in breeding within 

 the race and in crossings with the Dutch spotted cattle. Mating two animals of Dutch belted, 

 or an individual of Dutch belted with spotted, may give self-colored calves. A Dutch belted 

 bull gave with 55 Dutch spotted cows 27 Dutch belted, 24 self-black, and 4 spotted calves. 

 For explanation of this result the writer accepts two pairs of allelomorphic factors: LI for 

 belted markings, epistatic to Ee self-colored, and a repulsion between L and E in the redupli- 

 cation-series 1:7:7:1. Accepting these conditions, the observed facts are explained easily. 

 The writer supposes Dutch belted cattle are in most cases diheterozygous, or LlEe. The indi- 

 viduals with faulty markings, appearing in great number in crossings with spotted cattle, 



