122 GENETICS [BoT. Absts., Vol. IX, 



765. SoLER, Raphael Angel. Cultivo del tomate. [Tomato culture.] Rev. Agric. 

 Com. y Trab. [Cuba] 2: 479-483. Jtfig. 1919.— Progress is recorded in selection, 1917-1919, 

 from semi-wild plants, the original stock of which is supposed to have come from the Canary 

 Islands, 1849 or 1850. There were 3 types of tomato, — plum, pear, and ribbed. From the 

 ribbed of the 3rd crop the author selected several strains differing in smoothness of skin and 

 size. The selection was carried out for good salad size and for condiment. A table gives 

 data of the 3rd crop for number of fruits and total weight in the following classes: Large 

 salad size, commercial or cooking, large pear, small pear, plum. — E. E. Barker. 



766. TiscHLER, G. [German rev. of : Hertwig, G., und P. Hertwig. Triploide Frosch- 

 larven. (Triploid frog larvae.) Arch. Mikrosk. Anat. 94: 34-54. 1920.] Zeitschr. Bot, 

 13: 321-322. 1921. 



767. TiscHLER, G. [German rev. of: Rosenberg, O. Weitere Untersuchungen uber 

 die Chromosomenverhaltnisse in Crepis. (Further remarks on the chromosome relations in 

 Crepis.) Svensk Bot. Tidskr. 14: 319-325. 5 fig. 1920 (see Bot. Absts. 7, Entry 236).] 

 Zeitschr. Bot. 13: 320-321. 1921. 



768. Tischler, G. [German rev. of: Winkler, Hans. Verbreitung und Ursache der 

 Parthenogenese im Pflanzen- und Tierreiche. (Distribution and cause of parthenogenesis 

 in the plant and animal kingdoms.) 8vo, vi + 231 p. Gustav Fischer: Jena, 1920.] Zeitschr. 

 Bot. 13:317-320. 1921. 



769. Trelease, W. The survival of the unlike. Science 51: 599-605. 1920.— The species 

 and groups of species of agaves of the different islands of the West Indies differ from one an- 

 other somewhat in proportion to the depth of water between their habitats. In any 2 adjacent 

 islands the species differ sometimes in one character and sometimes in another, though no 

 climatic difference is evident. It is not obvious that these differences are, or were, of 

 survival value. — John Belling. 



770. TscHERMAK, E. VON. Beobachtungeu bei Bastardierung zwischen Kulturhafer 

 und Wildhafer. [Observations on hybridization between cultivated oats and wild oats.] Zeit- 

 schr. Pflanzenzilcht. 6: 207-209. 1918. — In hybrids between wild oats and cult vated oats 

 it has been determined that there is absolute coupling between the wild-oat characters, (Mi) 

 falling apart of the spikelets on ripening, that is, brittleness with breaking apart at the horse- 

 shoe-shaped callus, and (Ma) complete beardedness. On the other hand, there is complete 

 incompatibility of the wild-oat character, (M3) strong hairiness of the lemmas of all flowers, 

 and (TO4) the cultivated-oat character, yellow glume color; and also (in the observations of 

 the author) of the wild-oat character, (M4) brown glume color, and (ms) the cultivated-oat 

 character, glabrousness. Schematically represented :- 



Fi = Ml < mi] M2 ^ mi] Ms ^ ms; Mt > 7«4 



F2 = (1) (M1M2) (MM,) 



(2) (M1M2) (^3^4) 



(3) as Fi 



(4) (wima) {msmi) 



The following combination is lacking: 



(miTOa) (M3M4) 



These combinations are barred out: 



(M1M2) (m3M4), and (M1M2) (Mmd 



There is repulsion between groups (mimz) and (M3M4), that is, a coupling of groups (M3M4) 

 and (M1M2), but not vice versa. Limiting "wild-form" (wf) to the coupled character pair 

 brittle-fully-bearded and "cultivated-form" (cf) to non-brittle-weakly-bearded, then the 

 method of inheritance is as follows, agreeing with the barley-glume type: 



