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he predicted thiit his methods will be more \vidrly used as they become known and needless friir of perchloric iicid cvnporntes. liemarques sin l ~' A 1 1 i i l ~~~ lndircctc, 111). .I(;. Price 12 fr. This third volume is i i short esposition of the principles underlying, iind \veiikuesses in, inclircvt met hods of iiniilysis. It shows simple graphs :ind niathrninticnl esprcssions for the cspcrinicnt:il errors involved in indirect nictliotls as npplicd to biniiry and tertiary systems. As csniiiples, ititer crlin, t hr author treats of the nicthods for dctcrniiiiing sotliiini rind potassium in nuscd alkiilis, and inistiires of cholesterol, ergosterol, and qniosterol. He sho\vs graphically just what ciin i i n d cannot he done with snch niistures. H. E. C. 111.
SATUR-us11 KUSSTIIARZICS. 13s R. Houwink.
π SIMILAR VOLUMES
tncrits nrid tlcmcrits of t.hc idciis eiiihotlictl in m A i patcut. specilicnbions. A look, siicli ns this one, written for stndcnts, should n l \ v n p rliscriminnt~c clearly bctwcen pntcnts which hnrc succccdccl from those which lrnve not, ; and idcns which hnvc fnilcd should hc just ns c1c:irly s
he finds contrridictions bctwccn the conclusions of colloid chcniists and of soil workers. Dr, B1iirslinll concliidcs tlirit thc liydrogcn, cnlcium, niid miigncsinm clays will nlnriiys be in the congulatcd states, biit it is now knowi from ficld work that mngncsinm soils resemble sodium soils so clo