128 GENETICS [Box. Absts., Vol. VII, 



law is meaningless. He also objects to application of elaborate statistical methods when the 

 number of observed cases is as small as in Johnstone's problem and he suggests that the 

 mode and upper and lower quartiles, as determined directly from the observations, give all 

 the information desired. — Lowell J. Reed, 



866. BouviER, E.-L., and d'Emmerez de Charmodt. Mutation d'une Caridine en Ort- 

 mannie et observations generales sur les mutations evolutives des Crevettes d'eau douce de la 

 famille de Atyides. [Mutation of Caridina into Ortmannia and general observations on the 

 evolutional mutations of fresh-water shrimps of the family Atyidae.] Compt. Rend. Acad. Sci. 

 Paris 169:317-321. 1919. — Authors have previously stated that certain shrimps or prawns 

 (family Atyidae) of the Indo-Pacific region give rise by mutations to representatives of 

 previously known species of higher genera. Such changes are cited for the following forms : — 

 Caridina richtersi to Ortmannia edwardsi; Ortmannia alluaudi to Atya serrata, Ortmannia 

 henshawi Iw Atya bisulcata. The second of these is reported to have been experimentally 

 proven by Bordaqe, the two genera having been obtained from the same clutch of eggs. 

 The first is found experimentally by the writers to occur in a brood reared in an aquarium 

 (8 Caridina and 1 Ortmannia edwardsi). The species which give rise to the forms unlike 

 themselves are quite variable, but the higher forms (to which the derived forms belong) on 

 the other hand, are remarkably stable. Authors think the results not due to hybridization 

 since they do not find individuals with intermediate generic characters and Bordage did 

 not get pairing between the different genera. Results are attributed to evolutional muta- 

 tions. — A. M. Banta. 



867. Brotherton, W. E., Jr. The heredity of "Rogue" types in garden peas (Pisum 

 sativum). Michigan Acad. Sci. Ann. Rept. 21 : 263-279. PI. 7-13. 1919.— Describes "rogue" 

 type in garden peas, which occurs in varieties with large, wide pods and relatively broad 

 leaves such as Gradus, Duke of Albany, Early Giant and Peter Pan. Rogues differ from type 

 plant of variety in which they arise chiefly in reduced foliage (vetch-like), narrower pods 

 often sickle-shaped or curvature increased, height in general greater, either due to increase 

 in internode number or in internode length; often later-flowering, change from sub-cunei- 

 form seed of type to dnun-shaped seeds; rogue seeds average smaller and in green state 

 bitter as compared with sweet type seed. Sterile rogues rarely occur. Usually rogues equal 

 or surpass in productiveness the type. Author mostly worked with rogues from Gradus vari- 

 ety. Per cent of rogues to type in rogue-producing Gradus families was 9.6 (actual figures 5 

 rogues: 51 type.) Out of 150 Gradus plants selected at random, only one had rogues among 

 progeny. Summarizes data of Bateson and Pellew and confirms their results. In addi- 

 tion, finds in seedling stage, rogue plants are more variable in regard to ratio of length to 

 breadth of stipules than are type plants. Hybrids (rogue X type) resemble rogue parent in 

 this respect. Some evidence that rogues crossed with typical plants of non-rogue-throwing 

 varieties in F2 and following generations show segregation of width of stipule. Rogues not 

 comparable to any existing variety of pea. Observations are similar to those of White as 

 regards rarity of cross-pollination in peas under field conditions. Cites statement of Starr 

 that percentage of crossed Gradus plants under ordinary field conditions during one season 

 was very high. — Orland E. White. 



868. Burns, W. Some aspects of plant genetics. Agric. Jour. India 15 : 250-276. 1920. — 

 Author's Presidential Address to the Botany Section of the Seventh Indian Science Con- 

 gress, Nagpur, 1920. Importance of genetics in college or university curriculum is empha- 

 sized, and some pedagogical features of the subject are discussed.— Attention is called to 

 problems of bud variation, seedlessness in fruits, and inheritance of sex in plants, and to the 

 intimate relation of plant genetics to cytology and taxonomy. — Limitations in plant genetics 

 are pointed out, and the present lack of knowledge concerning causes of non-adaptive varia- 

 tions, and of mutations is discussed. — C. M. Woodworth. 



869. Clawson, Benjamin Junior. Varieties of streptococci with special reference to 

 constancy. Jour. Infect. Diseases: 26: 93-116. 1920. — Author sought to discover relation- 



