BOOK REVIEWS wns written), the use of punched cards for filing and rerovering information, determination of physird ppr~pcrties(such as density, refractive index, optical rotation, and especially almrption spertroscopy), and finally an experiment on the determination of dissorintion constants and one on rate constants (the deromposition of a n A'-hromasmide in hnse). The theoretical and prartirnl introdurtion to spectroscopy is 1,ricf hot it is very well done in this spare and at this level. I t is made extremely usahle for all srl.r,uls by the inclusion of seven pnges of large spectra accompanied I,? six unknown spertrn for the student to identify. I n this Renfrow and Has-kins will be cupied l,y every future manual writer. and the next, edition of the Itenfrtlw-Harkins huok will contain N31R. .4 simplified srhemntic of In and UV spectmphotsmeter would have been useful, although there is a sketrh oi the hnsir elements of nll such devices. I n any test it is very easy to find details to critieixe. A six and one-half line experiment on the ure of
