KOTANY. 309 



On cellulose and starch, Z. H. Skraup {Ber. Deut. Chem. GeselL, 32 (1899), p. 

 4.il3; abs.in Bui. Sac. C7mn. Parw, 3. ser., 23 {1900), No. 13, pp. 6^^,620). 



On cellulose, G. Bumcke and R. Wolffenstein {Ber. Deut. Chem. GeselL, 32 

 {1899), ]>]>. 2493-2507; aU. in Bnl. Sor. C'him. Paris, 3. ser., 23 {1900), No. 13, p. 620). 



Researches on the oxycelluloses, O. von Faber and B. Tollens {Ber. Deut. 

 Chem. GeselL, 32 {1899), pp. 2589-2601; abs. in Bui Sac. Chim. Paris, 3. ser, 23 {1900), 

 No. 13, p. 621). 



On the presence of dextrose and levTilose in the leaves of beets, L. Lixdet 

 {Bui. Sor. Chilli. Pari.t, 3. ser., 23 (1900), No. 13, pp. 544-549). 



A method for the determination of the melting point, M. Kuhara and M. 

 Chikashige (Chem. Neu-.-^, 80 {1899), No. 2089, pp. 270,271, fig. 1). 



Liquid air as an analytical agent, Dewar {Chem. News, 80 {1899), Nos. 2082; 

 pp. 187-190, fifji^. 2; 2083, pp. 199-202, figs. 2; 2084, pp- 212,213, figs. 3). 



Some new laboratory apparatus, M. Kaehler and Martini {ZUchr. Angew. 

 Chem., 1900, No. 21, pp. 518, 519, figs. 5). — Descriptions are given of E. A. Taylor's 

 modification of Soxhlet's extraction apparatus for determining fat in solutions and of 

 the apparatus for the determination of niti'Ogen according to Kjeldahl, a new water 

 pressure pump, and a modification of Sonnenschein's gas blast lamp. 



Apparatus for fat extraction, R. FRtJHLiNG {Ztschr. Angew. Chem., 1900, No. 11, 

 p. 2'fO, fig. 1). — A description of an apparatus in which mercury seals are used instead 

 of cork. 



Absorption apparatus for elementary organic analysis, F. G. Benedict 

 {Amer. Chem. Jour., 23 {1900), No. 4, pp. 323-354, figs. 2). 



An improved Gooch crucible, W. C. Heraeus {Ztschr. Angew. Chem., 1900, No. 

 30, p. 745). — This is a note on H. Neubauer's recommendation to use a layer of 

 platinum sponge instead of asbestos in the Gooch crucible. 



A convenient laboratory apparatus for the generation of gases, N. J. Lane 

 {Jour. Sor. Chem. IinL, 19 (1900), No. 1, p. 14). 



A simple filter press for laboratory use, W. von Loeben {Chem. Ztg., 24 {1900), 

 No. 19, p. 198, fig. 1). 



New form of water-bath regulator, H. S. Hatfield {Chem. News, 81 {1900), 

 No. 2098, p. 65, fig. 1). 



BOTANY. 



The migration of food material in leaves, G. M. Tucker and B. 



Tollens {Ilr. Beat. Clwoi. GeselL, 32 {1899), jjp. 2575-2583; abs. in 

 Jovr. Roy. Micros. Soc. [Londem\ 1900, Mo. 2, jj. 220).— In the case 

 oi leave-s of the plane tree, the weight of the ash is said to increase 

 until the death of the leaves, and then slig-hth^ decline. The same is 

 the case with silica and lime content, but chlorin and sulphuric acid 

 show a continuous increase. Leaves gathered in November contain 3 

 times as much sulphuric acid as leaves gathered in June. Phosphoric 

 acid and potash increase slightl}^ until the death of the k\a\'es. after 

 which they diminish to less than one-half their original quantity. 

 The amount of nitrogen decreases continually to less than one-fourth 

 its original (juantity. There appears to be but little retrogression of 

 food materials from the leaves to the stem or branches. Rain, it is 

 said, has little if any washing-out action on the food material in the 

 leaves. 



