May, 1920] GENETICS 211 



carried indifferently by either sperm or <'gg and I herefore can 1 1 • > t- In- t be same as (2) the agents 

 determining the type of the gametes themselves, as seen particularly in hermaphroditic spe- 

 cies. The egg and sperm are considered to be composed of either "active," androplasmie or 

 "passive" gynoplasmic protoplasm. The union of these substances at fertilization is consid- 

 ered as a form of parasitism and their continuation in the zygote as a symbiosis. Bef »re 

 gamete formation occurs separation of these two substances takes place in such a way that 

 certain gametes (the eggs) are predominatingly gynoplasmic while others (tin- bjxti 

 androplasmic. This separation of the two different kinds of protoplasm is not the same as 

 the segregation of the sex factors or sex chromosomes. Each kind of protoplasm may retain 

 the potentiality of the other so that apogamously developed eggs may therefore still possess 

 the capability of producing the other type of zygote. — D. F. Jones. 



1486. Kooiman, H. N. [Rev. of: Lotsy, J. P. Mutatie of kruising de oorzaak der evo- 

 lutie? [Mutations from crossing the cause of evolution?] Nederland. Tijdschr. Geneeskunde 

 17: 1395-1404. 1918. (See Bot. Absts. 4, Entry 652.) Genetica 1: 484-485. Sept., 1919. 



1487. Kraus, E. J., and H. R. Kraybill. Vegetation and reproduction with special ref- 

 erence to the tomato (Lycopersicum esculentum). Oregon Agric. Exp. Sta. Bull. 149. 90 p. 

 22 fig. 1918. — The chemical and physical requirements of tomato plant, particularly with 

 respect to available nitrogen and moisture supply and opportunity for carbohydrate syn- 

 thesis, are closely associated with its ability to set and mature fruit; hence heredity, as ex- 

 pressed in yield, may not always be the limiting factor in productiveness. With our present 

 knowledge of the subject, both environmental and hereditary factors must be considered 

 in attempting to explain reproduction or vegetative behavior of plants. [See Bot. Absts. 1, 

 Entry 1402.]— C. E. Myers. 



1488. Kuiper, K. [Rev. of: Punnett, R. C., and the late Major P. G. Bailey. Gen- 

 etic studies in poultry. I. Inheritance of leg-feathering. Jour. Genetics 7: 203-213. May, 

 1918. (See Bot. Absts. 1, Entry 492.)] Genetica 1: 491-492. Sept., 1919. 



1489. Lillie, Frank R. Tandler and Keller on the free-martin. Science 50: 183-184. 

 August 22, 1919. — Author calls attention to a paper by Tandler and Keller (Deutsche tierarztl. 

 Wochenschr. 19: 148-149. 1911) in which evidence was presented, indicating that a heifer 

 calf, twin with a male, is malformed and sterile whenever there is anastomosis of her blood 

 vessels with those of the male twin in the fused chorions. In one case out of seventeen there 

 was no macroscopic vascular anastomosis and only in this case was the female twin normal. 

 It is noted that the conclusions are the same, as far as they go, as those reached wholly inde- 

 pendently by author (Jour. Exp. Zool. 23: 371-452. 1917). — Sewall Wright. 



1490. Lotsy, J. P. [Rev. of: Bateson, -W. Root-cuttings, chimaeras and "sports." 

 Jour. Genetics 6: 75-80. 1 pi. Dec, 1916.] Genetica 1: 457-458. Sept., 1919. 



1491. Lotsy, J. P. [Rev. of: Kooiman, H. N. Over de beteekenis van het kruisen van 

 individuen, behoorend tot verschillende Linnesche soorten, voor het ontstaan onzer huisdieren. 

 [On the significance of crossing of individuals belonging to different Linnean species, for the 

 origin of our domestic animals.] Ardea 7: 108-114. 1918. (See Bot. Absts. 4, Entry 636.) 

 Genetica 1 : 475—178. Sept., 1919. 



1492. Lotsy, J. P. [Rev. of: Lehmann, E. Ueber reziproke Bastarde zwischen Enilo- 

 bium roseum und parviflorum. (On reciprocal hybrids between Epilobium roseum and E. par- 

 viflorum.) Zeitschr. Bot. 10: 497-511. 1918. (See Bot. Absts. 3, Entry 266.)] Genetica 

 1: 478. Sept., 1919. 



1493. Lotsy, J. P. [Rev. of: Morgan, T. H., A. H. Sturtevant, H. J. Muller, and 

 C. B. Bridges. The mechanism of Mendelian heredity. 262 p., 64 fig. H. Holt and Co.: 

 New York, 1915.] Genetica 1: 486-491. Sept., 1919. 



