1014 FA'PERIMENT STATION HECORD. 



The order of formation of the elements of the central cylinder in roots and 

 stems, (i. BoNNiKii {('omj)!. Rend. Ac<i<J. Sci. I'<irlx, I.: I i j:i()0), X'>. ^'0, pp. 781-789, 

 fiyx. 6). — Tbie "eiu'ral structure of the <-eutr:il cylimler and tliat of the stem and root 

 and the order of tlie ilcvcloiiuient of the tissues are the same exeept in the different 

 position of tlie litriieous poles. 



Some ways of seed distribution, F. II. I In. i.. man (Xevnda Sin. Bui. 48, Ediirn- 

 ilonal Scr. Ill, }>p. 10, fiijx. /.J). — The author tiirun'S and popularly describes some of 

 the methods l)y which seeds of weeds and f)ther plants are distributed. 



Exchange seed list No. 5, W. A. Setchell and J. 15. D.wy {Oilifoniia Sta., 1900, 

 Dec, p}>. 11). — A list is ^riven of seeds of economic plants which are offered for 

 exchange and a list given of seeds whicli are desired by the department of botany at 

 the station. The seeds enumerated in tliis list are for exchange only. 



Ne-w sug-ar-yielding plant in French Central Africa, A. Chev.vijer {Sitcr. 

 Iiidig. (1 Co/diiidlc, .'>7 (1.901), Nd. S, ])p. 7o-81). — The plant discussed in this article is 

 Bourgou {Pdvirnin hnrgu). 



Influence of atmospheric humidity on vegetation, S. Mottet (lor. Hi,,!., 7-> 

 {1901), No. a, pp. 38, 39). — The author lielieves the role of atmospheric Iniinidity in 

 plant growth is greater than is usually supposed. Observations on the growth of a 

 nund)er of different plants as influenced by atmospheric humidity are presented. 



Reproduction in relation to problems in hybridization, ( ). Ames(.I/«^'/-. fhird., 

 22 (1901), Xii. SJIJ, p. 130). — A controversial article. 



Reserve carbohydrates of Thaliophytes, G. Clautki.\u {Misc. Biol, ded an A. 

 O'iard; nh.-i. in .four. Uni/. Mirro.^. So/: [l.oiidoni, 1900, No. 6, p. 698). — According to 

 the autlior, the most abundant carl)oh}(lrate in the Myxomycetes is glycogen, wliich 

 usually occurs in the j)lasmodia in a half-dissolved I'ondition. The spores contain 

 only oily substances. The Peridiniepe contain drops of oil and pure starch, and their 

 membranes give the reaction of cellulose. In the Cyanophycefe a reaction with iodin 

 is given, resembling that of glycogen, and tlu' presi'iice of glycogen in bacteria is 

 believed probable. In the green algfe starch is abundant, and in many of the red 

 alga^ a carbohydraJe closely resembling starch is present. Fimgi are said to contain 

 an abundance of glycogen and oily substances, besides various forms of sugar, glucose, 

 levulose, trehalose, and mannite. 



The influence of chemical agents on the groAvth of algse and fungi, N. Oxo 

 {Jonr. Col. Sri. Imp. Vnir. Tuki/o, 13 {1900), j>p. 141-180. jd. 1; <(/«. in Jour. lioii. 

 Micros. Soc. [London], 1900, No. 6, pp. 698, 699). — A large number of experiments are 

 reported upon, in which the effect of different chemical salts upon algre an<l ftuigi 

 is sIkavu. Extremely dilute solutions of some poisonous salts were found to iiromole 

 the growth of the lower algte. Among these were zine sulphate, iron suli)hate, 

 (!opper sulphate, and iron arsenite. These substances favored the multij)lication 

 of the organisms rather than increase in the size of the individual. The fungi were 

 found to l)e more sensitive to small (juantities of mineral salts tlian the alga% and the 

 formation of spores was especially chec^ked by these sul)staiu'es. The ojitimiun con- 

 centi'ation of mercurial chlorid for fungi was found to be about 0.00i;5, and of coi)|)er 

 sulphate about ().t)12. 



The meaning of mycorrhiza, E. ^■r\u\.(J(thrJ). llV.s.v. lial. [Pring.^liciiul, 34 {1900), 

 pp. 539-068, figs, i; ahx. i„ .lour. Roij. Micros. Sue. [/.<*// r/o/i], 19U0, No. 6, p. 707).— TUa 

 author enumerates all tlie i>lants in whicli ectotroj)ic and endotropic mycorrhiza are 

 known to exist. At present, mycorrhiza are unknown in the families Crucifera?, 

 Cvj)erace8e, and Polypodiacea*; but the author considers it ])robable that the greater 

 number of the higher plants are capable, under certain circumstances, of entering 

 into symbiosis with fungi. The explanation of the occurrence in the same forest of 

 plants which do and othei's which do n<it nldain their nourishment in this way is 

 found in the difference in their facililv of aitsm-binir niiiieral food material. Plants 



