T h e date of publication of each review is given in brackets at the end of each entry CHEMISTRY Bmsn, J. \Ir. Nntiirnl 'rerpc1icY. 1'1). riii + 169. Tmitloii : JIcthucn ,P. Co., 1!)30. 6s. (JLr. 27, 1931.) RRCCKSER, 11. ICntnlytische Ihktioiieii in tlcr Orgniiiwh.Chrrnischcn Iiiclristric. 'rcil I. Tccliiikclie Fortsclirittslwriclitc. Fortscliritto (lor cheiii. Tcclinologio i i i Ein~cltlcrstelliiii~cii. Eclitctl by Prof. 13. Itnssow. I3iuitl S S I I . Pp. 171. Drcsdrii niitl .In.ipLig : 'I'. StciiikopK. 1'330. 13ouiitl, 15 in. : pnprr, 14.50 in. (Oct.. 31, 1!)30.) FitiEsi), J. SE\STOS (Etlitctl I J ~) . A T e s t -I h k of Iriorgiiiiic Clieniistrj. Vol. S I . Orgn~ioi~ict~illie coiiipoiiiitla. l'nrt 1T.-Dcrirntires of :\rsriiic. 1 % ~ A. E. (:OI)lh\Ill). 1' 1). ssriii + 60.5. Imitloii : Grillin , ' k Co., 1!)80. 42s. (Oct,. 31. 1!)30.) C:JIELIBS H ~i ~i t l b ~~~l i dcr Aiiorgnnisclicii Clicriiic. Stli etl. System So. 6'3. K i w i . Tril B. Lcifcriing 2. 1'1). 313-512. 32 in. (Oct. 31, 1930.) Tril, 13. Ikifcriing 3. Pp. ss -+ 513-05fi. 24 in. Jkrliii : 'c.rlng Clieniic, 1!l30. (Dee. 12, 1030.) HAAS, l'., niicl T. G. Ii1i.L. 1\11 Iiitrotliiction to tlic C.'lic*riiistry of Plnnt Products. Vol 1. On tlic Xitiirc a n t 1 Siuiiiticiiiicc of the Commoner Orgnnic ~~' o ~i ~p o i i ~~~l s o f I'lnntri. 4th cd. Pp. xri + 630. Lolidon : I,oiigiiinns, Grrcii ,t Co., 1928. 18s. (Jan. 1G. lV31.) f l A A s , P., and 1'. <:. ILL. hi hitrothetion to the C'licniistry of Plnnt Protliicts. .Val. I I. Jlctnbolic l'roccsws. 2nd eti. Pp. viii -+ 220. I,ontloii : Longniniis, (:wcti , k Co., 1920. 10s. 611. (Jail.