No. 1, July, 1920J <.IA"KTICS 109 



G71. Malthottsb, G. T. Seedling potatoes. Gard. Chron. 66:291. Dec. 6, 1919. — 

 Refers to previous article by Fred J. Chittenden, and gives further example 

 toes that were apparently identical to previously introduced varieties. -Fred \. Krantz. 



672. Mamukic, V. Prilog gojidbi Kukuruza. [Contributions to the breeding of maize.] 

 Gospodarska smotra 1918: 1-1. 1918. 



673. Mavdkkic, V*. Nesljectivonje nikih divjstore Kost Kulkuruza. [Inheritance of 

 several characters in maize.] Gospodarska smotra 1918:5-8. 1918. 



674. M. vim i;r, E. Acclimatisation trials of lima beans (Phaseolus lunatus). Gardens' 

 Bull. Straits Settlements 2: 121-129. 1919.— See Bot. Absts. 4, Entry 97. 



C.7~i. M ^tbk-Gmelin, II. Mededeelingen omtrent enkele kruisings en veredelingsproef- 

 nemingen. [Reports on several experiments in crossing and selection.] Cultura 30: l-lli. 

 4 pi. 191S. — The paper gives three reports about experiments in crossing and selection: 

 1. Natural hybridizations in beans; 2. Natural hybridizations in wheat and spelt; 3. Selection 

 in rye and the difference in result of sclfing between different plants of rye. 



1. In a previous paper the writer published some researches about crossbreeding of beans; 

 his experiments in 1916 and 1917 were made in this manner, that two plants of different races 

 were isolated together in one cage, humble-bees were brought therein to obtain if possible 

 hybrids between these plants. The experiments failed; while in the posterity of the freely 

 flowering plants spontaneous hybrids were observed, sometimes in 2 per cent the plants iso- 

 lated in cages did not yield any hybrid. The cause of this failure is still unknown. 



2. Spontaneous hybridization in wheat results not only, if different races of wheat are grown 

 in the vicinity of each other, but also if wheat is grown near spelt. The difference of sensi- 

 bility for crossing, already observed by Nilsson-Ehle, was also remarkable in the writers cul- 

 tures; his experiments gave besides spontaneous crossings between wheat varieties also 

 between wheat and spelt. The maximum of such crossings between races of wheat was found 

 to be 0.87 per cent, between wheat and spelt 0.43 per cent. Self fertilization is far the most 

 important in wheat, but crossing sometimes happens especially in the earlier races. 



3. Selection in rye has shown that between different plants of rye a great difference exists 

 regarding sensibility for selfing. Some isolated plants have only empty ears, others con- 

 tained a more or less important number of grains. By selection along these lines breeding of 

 selfing races of rye will be possible. — M. J. Sirks. 



676. M [ayor], A. G. [Rev. of: Cramptox, Hexry Edward. Studies on the variation, 

 distribution, and evolution of the genus Partula. The species inhabiting Tahiti. Carnegie 

 Inst.' Washington Publ. 228. 313 p., 34 pi, 7 fig. Jan., 1917.] Science 51: 142-143. Feb. 

 6, 1920. 



677. Metjnissier, A. Experiences genetiques faites a Verrieres. [Genetical experiments 

 made at Verrieres.] Bull. Soc. Nation. Acclimat. France 1918: 1-31. 1918. — Resume of the 

 genetic work at Verrieres-le-Buisson under the direction of Philippe de Vilmorin from 1902 to 

 1914. References to other genetic work arc intermingled. — In Pisum, the parchment of the 

 pod, the form of the pod, the bloom on the plant, adherence of the seeds, absence of tendrils, 

 number of flowers on the peduncle, and the colored eye of the seed, have been especially 

 studied. A commercial pea without tendrils has been raised. — In Triticum, the color and 

 branching of the ear, supernumerary spikelets, and height of plant, have been attended to. A 

 dominant dwarf, existing only as a heterozygote; and a distinct maternal influence on the 

 height of the Fj generation, have been found. New wheats have been raised for the Balkans, 

 Algeria, Argentina, and Chile. In the last three cases, the best varieties of the country 

 were crossed with high-yielding European kinds. — With Avena a secular experiment has been 

 started, by growing the same 4 constant strains in England, Sweden, Germany, Holland and 

 France. — In Hordeum, a recessive strain with smooth awns is considered useful in some 

 cases. — Species crosses were studied in several genera. In Argcmonc, double flowers and 



