330 EXPERIMENT STATION RECORD. 



Experimental researches on the assimilation of ammoniacal and nitric nitro- 

 gen by the higher plants, E. Laurent, E. Marchal, and E. Carpiaux (Jour. Soc. 

 Agr. Brabant-Hainaut, 1897, No. 9). 



How plants attract insects, F. Plateau (Reviewed in Naturw. Rundschau, 12(1897), 

 No. 32, pp. 407, 408). 



Investigations on the freezing of plants, H. Molisch (Reviewed in Naturw. Rund- 

 schau, 12 (1897), No. 35, pp. 442-444). 



Injurious effect of asphalt vapors on the Berlin gardens, P. Sorauer (Garten- 

 flora, 46 (1S97), No. 12, pp. 317-320). 



Concerning positive and negative heliotropism, F. Oltmanns ( Flora, 83 (1897), 

 No. l,pp. 1-32). 



Pfaff's observations on the nature of ivy poisoning, B. F. Robinson ( Amer. Nat., 

 31 (1807), No. 370, pp. 901-903). — A review of Pfaff's work on Rhus poisoning is given. 

 The poisonous principle is said to be an oil to which the name Toxicodendrol is given. 



Concerning the mechanical effect of rain on plants, J. Wiesner (Ann. Jard. Bot. 

 Buitenzorg, 14 (1897), II, pp. 277-353). 



Cutting and mounting cereal grains and starchy tubers, J. D. Hyatt (Internat. 

 Jour. Micros, and Nat. Sci., 3. ser., 7 (1S97), No. 35, pp. 250-255, pi. 1). 



The injury to plants by asphalt vapors, II, P. Sorauer (Ztschr. Pflanzenkranl., 

 7 (1897), No. 2, pp. 84-89, figs. 3). 



The parenchyma sheath in the leaves of dicotyledonous plants, B. Schubert 

 (Bot.Centbl, 71 (1S97), Nos. 10, pp. 337-347; 11, pp. 385-395). 



A study of cork formation by plants, F.. Matteucci (Ricerche e Lav. Roy. Mus. 

 Orto Bot. Firenze, lS96-'97, 1, pp. 87-108). 



A new method for micro-chemical treatment and embedding of very small 

 and soft objects, A. Schydlowsky (Ztschr. tvissensch. Mikros., vol. 13, No. 2; abs.in 

 Bot. Centbl., 71 (1897), No. 7, p. 230). 



Influence of various external factors on the water transfer of plants, P. 

 Kosaroff (lnaug. Diss., Leipzig, lS97,pp. 04). 



Some phenomena in the ripening of acid fleshy fruits, C. Gerber (Assoc. Fr. 

 Av. Sci. Congres Carthage, 1S96, II, pp. 412-421). 



The influence of soils on the color of the flowers of Hortensia, W. Zorp 

 (Natur., 46 (1897), No. 27, pp. 318, 319). 



Influence of lecithin on growth, Danilewsky (Compt. Rend. Soc. Biol. Paris, 

 1897, May 15). 



Root tubercles of legumes, their relation to their host plants, C. Naudin 

 (Jour. Agr. Prat., 61 (1S97), II, No. 27, p. 46). 



The factors of growth and their influence on plant production, R. Ulrich 

 (FuhUng's landw. Ztg., 46 (1897), No. 16, pp. 4S2-4S9). 



On the biology of flowers, P. Knuth (Bot. Centbl., 70 (1897), No. 11-12, pp. 337- 

 340, figs. 2). 



On the distribution of plants, H. Hesselman (Bot. Noliser, 1897, No. 3, pp. 16: 

 abs. in Bot. Centbl., 71 (1897), No. 6, pp. 216, 217). — The author has made a partial 

 study of the means of plant dissemination on the east coast of Sweden. 



The origin and distribution of the phelloderm, F. Kuhla (Bot. Centbl., 71 

 (1897), No. 3, pp. 81-87). 



ZOOLOGY. 



The habits, food, and economic value of the American toad, 

 A. H. Kirkland (Massachusetts Hatch. Sta. Bui. 16, pp. 30, Jigs. 25, 

 pis. 2). — This details the results of a study begun in the summer of 1895 

 of the stomach contents of 149 toads collected alive from various parts 

 of Massachusetts. The fallacious ideas concerning the toad held by 

 the ancients and by some people even during the present century are 



