BOTANY. 421 



Tho (U'tennination of coiimarin in tlio presence of vanillin lian, therefore, Ix-come a 

 problem for the analytical chemist. 



A method of separation and identification is subniitti'd by the authors. This 

 method depends upon the aldehyde and phenol character of vanillin. The alcohol 

 is evaporated from the extract to be examined, normal lead acetate added, and the 

 •precipitate extracted with ether. The ether solntion is treated with dilute ammonia 

 when the vanillin is extracte<l, leaving the conmarin. Detailed directions are then 

 givi-n for their identification. 



Contribution to the analysis of tanning- materials, .1. I'aksslkk (/>'»/. Assoc. 

 Bt'hjc Cliiin., 15 [r.ioi), No. S, pp. 115-1±^. 



Determination of tanning- matter in tanning materials, T. Koekneh {Leollim- 

 Manufacturer, 11 {1900), pp. 241-i^48; abs. in Jour. Soc. Chern. Ind., 20 {1901), No. 3, 

 pp. 286,287). — Methods of analysis as presented and discnssed in a paper read by O. 

 Carr before the meeting of the Association of Official Agricultural Chennsts, held at 

 Washington, D. C, November, 1900. 



Notes on the absorptive influence of the materials used in the determina- 

 tion of total soluble matter in tanning- extracts, A. B. Searle {Leather Trades 

 lu-r., S4,pp.S2-ll(i; ahs. in Juvr. Sue. ('lion. Ind., 20 [1901), No. 3, pp. 264,265).— Tests 

 of various filter papers. 



Selected methods of chemical analysis, A. Classen {Aasgeiriildle Methoilm der 

 analytischen Chemie. Brunswick: Friedrich Vieweg & Son, 1901, vol. 1, pp. XN-\-940, 

 figs. 78). — Qualitative and quantitative analytical methods of determining common 

 and rare elements and the alkalis. 



The influence of agricultural chemistry on soil culture, E. Haselhoff {Der 

 Einjiuss der Agriknlfiircheniir aiif die Bodetd:vUur, 1900, jip. 10). — A historical review. 



On the velocity of chemical reactions, W. Duane {Amer. Jour. Sci., 4- ser., 11 

 {1901), No. 65, pp. 349-356). 



Inorganic ferments; the preparation of colloidal metals by the electrical 

 method and the investigation of their catalytic properties, G. Bredig {Anor- 

 ganisclie Fermente. Darstellung kolloidaler Metalle auf elektrischem Wege und Untefsuchung 

 ihrer katalt/tischen Eigrnschnffen. Jjcipsic: EngeJmann, 1901, pp. 99). 



On inorganic ferments. II, The paralysis of platinum catalysis by poi- 

 sons, G. Bkedk; and K. Ikeua {Ztschr. Plnjsihd. Chem., 37 {1901), pp. 1-68). 



A simple method for obtaining a saturated aqueous solution of sulphu- 

 retted hydrogen, or a constant supply of the gas, F. M. Perkix {Jour. Soc. 

 Chem. Ind., 20 {1901), No. 5, p. 438, fig. 1). 



An automatic filtering apparatus, J. Winklhofer {Chem. Zfg., 25 {1901), No. 

 59, p. 628, fig. 1). 



Microchemical technique, T. H. Behrens {Mikrocheniisclic Tecftnik. Humhutg: 

 Leopold Voss,1900,pp TT/J+6\s'). 



BOTANY. 



Iffanual of the flora of the Northern States and Canada, N. L. Bkitton {New 

 York: Jfenrg IIoH & Co., 1901, pp. X-\ 1080). — This manual gives descriptions of the 

 ferns, fern allies, and seed-bearing plants which are known to occur within the area 

 extending from Newfoundland to Manito])a, and southward to the southern bound- 

 aries of Virginia, Tennessee, and Kansas. Considerably more than 4,000 species are 

 enumerated, many of which are deserilied for the first time. In conformity with 

 many recent scientific publications, the metric system of measurements has been 

 adopted throughout. 



This work is based upon the text of Britton &. Brown's illustrated Flora ( K. S. 

 R., 8, p. 291), the illustrations of which have been omitted and the descriptions 



