AGRICULTURAL BOTANY. - 525 



to dwarfs occurring in both cases in unexpectedly large numbers. The less 

 complicated of these two cases {CE. reynoJdsii n. sp.), with some of its descend- 

 ants, is discussed as regards some studies made thereon. 



The phenomenon presented by CE. rei^noldsii, called here mutation en masse, 

 appears in one of the short-styled self-pollinating species. It seems clear to 

 the author that mutation en masse bears a certain degree of resemblance to 

 Mendelian segregation. No explanation suggests itself for the enormous sur- 

 plus of dwarfs in the progenies exhibiting diversity, unless perbaps it is that the 

 results are complicated by selective germination or selective mortality. At any 

 rate the ratios thus far obtained do not conform to any Mendelian expectation. 

 The origin of mutant Wlonga from mutant deMlis, it is thought, may instance 

 the origin of a new character. 



Studies in pea varieties and hybrids therefrom, H. Kappert (Ztschr. In- 

 duktive Abstam. u. Vererbungslelire, 13 (1914), No. 1-2, pp. 1-51, figs. 20). — 

 This is a study, in some detail, of the several characteristics as regards the 

 starch grains, surfaces, chemical constituents, physical peculiarities, etc., of 

 some garden varieties of peas and their hybrids. 



A flora of Cuba, M. G. de la Maza and J. T. Roig {Estac. Expt. Agron. 

 Cuha Bol. 22 {19U), pp. 182, pis. S3, fig. J).— This work is in four parts. The 

 first deals in a general way with living plants (listing genera) and fossils 

 (listing families, genera, species, etc.) of this region. The second gives a dis- 

 cussion of the flora of Cuba in relation to that of other regions. The third in- 

 dicates collections and other facilities for botanical study. The fourth deals 

 with plants in their economic aspects. 



Geography and vegetation of Northern Florida, R. M. Harper {Fla. Goal. 

 Survey Ann. Rpt., 6 (1914), pp. 163-437, figs. 51).— The author gives the results 

 of several years' study on the original distribution of the native vegetation in 

 relation to the several geographical divisions of the State of Florida, as con- 

 tributing to a better understanding of the complex relations existing between 

 native vegetation, topography, drainage conditions, and soils. 



Lists of native plants and an index of plant names are included. 



Plant ecology and floristics of Salton Sink, S. B. Parish (Carnegie Inst. 

 Washington Pub. 193 {1914), pp. 85-114). — This contribution includes a cita- 

 tion of the very scanty existing botanical literature on the Salton Sink; a dis- 

 cussion of the derivation, distribution, and determining factors of the flora ; a 

 description of the various floral formations and associations; a consideration 

 separately of the trees as classed with regard to soil moisture; a numerical 

 analysis of the flora ; and a catalogue of the plants collected in this depression. 



Movements of vegetation due to submersion and desiccation of land areas 

 in the Salton Sink, D. T. MacDougal (Carnegie Iiist. Washington Pub. 193 

 (1914), pp. 115-182, pis. IS, figs. 2). — ^An account is given in considerable detail 

 of studies carried on at intervals since 1904 in the Salton Sink, as concerned 

 mainly with organisms overwhelmed by floods, with the physical changes which 

 follow emersion, and with the biological mechanism of reoccupation in areas 

 emerging from the water as related to the present distribution of plants and 

 animals. Such factors are considered in this connection as soil, climate, pre- 

 cipitation, and changes occurring in solutions and in precipitates. Submergence 

 and emergence with corresponding biological alterations are thought to have 

 occurred here many times in the last few centuries, and the accompanying com- 

 plex interplay of biological and mechanical agencies is partly described and 

 partly suggested. 



The behavior of certain micro-organisms in brine, G. J. Peirce (Carnegie 

 Inst. Washington Pub. 193 (1914), pp. 49-69, pis. 3, fig. 1). — Reporting a further 

 study (E. S. R., 30, p. 431) of organisms in the Bay of San Francisco, some of 



