No. 3, January, 1922] ECOLOGY, PLANT GEOGRAPHY 149 



972. Frye, T. C. Plant migration along a partly drained lake. Publ. Puget Sound Biol. 

 Sta. 2: 393-397. 1920. — Shore plants migrate with the water level or perish when the level 

 falls permanently. Erosion is a factor in keeping some submerged plants below a certain 

 depth. It is doubtful whether floating seeds are a factor in determining shore plants, because 

 the power to float is very general among plants not especially water-loving. The seeds 

 of some thistles may roll on smooth water like tumble-weeds on a prairie. — T. C. Frye. 



973. Fuller, George D. An edaphic limit to forests in the prairie region of Illinois. 

 [Abstract.] Ecology 1: 64. 1920. 



974. HoFMANN, J. V. The establishment of a Douglas fir forest. Ecology 1: 49-53, 63. 

 1 fig. 1920. — Production of heavy crops of seed, which are cached by rodents, retention of 

 viability for long periods and through forest fires after burial, quick germination under favora- 

 ble conditions, and rapid development of a long radix are the main factors leading to the 

 establishment of Douglas fir as a stage in the forest development of the Cascade and Coast 

 ranges. Its inability to endure shade eliminates it from the climax forest of the region. — 

 Charles A. Shull. 



975. Jassoy, a. Die Pflanzenformationen der osterreichischen Kiistenlander in Licht- 

 bildern. [The plant formations of the Austrian coast provinces.] Ber. Senckenberg. Naturf. 

 Ges. Frankfurt a. M. 47 : 80-81 . 1919.— A brief r^sum^ is here given of an illustrated lecture on 

 the vegetation of the countries bordering the Adriatic Sea. The presence of 2 rare and peculiar 

 conifers, Picea Omorica and Pinus Peace, is especially emphasized. — A. W. Evans. 



976. Nichols, George E. The vegetation of Connecticut. VII. The associations of 

 depositing areas along the seacost. Bull. Torrey Hot. Club 47: 511-548. Fig. 1-10. 1920.— 

 Such areas are divided into 3 groups: (1) Stony bottoms and beaches, (2) sandy bottoms, 

 beaches, and dunes, (3) muddy bottoms and shores and coastal swamps. In the 1st group are 

 discussed the associations of the sublittoral, littoral, and supralittoral regions, including 

 those of the shingle beaches. Under the 2nd are treated those of the same 3 regions, with a 

 discussion of successional relations. Under the 3rd are discussed: (a) The associations of 

 the salt marsh series, including muddy bottoms of sublittoral tidal flats, of lower littoral, the 

 midlittoral marsh, and upper littoral marsh, and supralittoral region; also muddy beaches; 



(b) associations of brackish marsh series, with a somewhat similar series of divisions; and 



(c) associations of the fresh marsh series. Successional relations along depositing muddy 

 shores are also treated. — P. A. Munz. 



977. Setchell, W. A. Stenothermy and zone-invasion. Amer. Nat. 54: 385-397. 1920.— 

 From the standpoint of distribution and effective reproduction, the author considers that 

 stenothermy is the rule in marine plants. Stenothermy implies persistence normally between 

 narrow temperature limits. The author recalls his previous division of surface waters of the 

 ocean into zones according to courses of 10, 15, 20, and 25°C. isotheres and the fact that the 

 majority of species are confined to one or another of these zones. Certain apparently excep- 

 tional (eurythermal) species are taken up, such as Zostera marina, which has effective methods 

 of vegetative reproduction and dispersal, and Ascophyllum nodosum of the upper boreal zone, 

 which appears as far south as New Jersey because there is suflBcient seasonal duration below 

 10°C. for reproduction. — James P. Kelly. 



978. Shull, C. A. The formation of a new island in the Mississippi River. [Abstract.] 

 Ecology 1: 65. 1920. 



FLORISTICS 



979. Bews, J. W. Some general principles of plant distribution as illustrated by the South 

 African flora. Ann. Botany 35: 1-36. 1921. — After a somewhat extended general discussion 

 of some of the chief principles in plant distribution, the present-day conditions in South 

 Africa are summarized. The climatic areas are arranged in order of increasing mesophytism 



