Berlin : Urban k Sch\mrecnbcrg, 1929. This scctioii forins the second instdmciit of 1'01. 2 of Abt. I, Tcil 2 (2nd half), \vhich is to includo, later, Delinlogenntion, by Dr. Jhucr, a i d Saponification, by Dr. Uaclicr.
It is n geiicrnl complaint against organic chemists that the siiiiplcst plaiits aud orginisms are able to effect comp\icnted syiithcscs which cnii oiily bc carried out in tho laboratory by drastic methods such as nitrations, chloriiiations, illliiili fusions, a ~i d SO on, but SO long as this is true the uunicrous processes for effecting halogenations will rcinaiii of outstanding iinportauce. For this reason Dr. Baucr's csccllcnt summary of the various mcthods of carrying out this operation is of great viituc for organic chemists, whcthcr of the biochcmiciil variety or iiot.
Thc valuc of the monograph is ciihanced by the 15 page nlplinbeticnl table of thc metliods of halogenation at the end, which enables one to siirvcy rapidly the posssiblc nictliods ot lialogciiatioii unclcr varying couditioas. It is nluiost iiecdlcss to add that the sectiou is ~rell priritcd and arriiiigcd, and iis it is wry fully documented, it sliould be a valuablc adjunct to thc laboratory ~IAXDUUCII D E I ~ UIOLOGISCIIES ARBELTSMETIIODES.
~CETALLOHCBSISCIIER
VEIZDISDUXG ES.