grnph IIIb. If, with this sample weight, difficulty is experienced in redissolving the solid in dilute nitric ncid, the dnrk brown residue of mnngnnesc dioxide lllny be tnken up readily by the nddition of 2 or 3 drops of sulphur dioxide solution. Any excess must then be cxpelled by boiling gently, prior to tho continuation of the process. When severnl cast irons of borderline phosphorus content were received. Furthermore, certain snmples showed a marked vnrintion of rnnge. In such cnses, it wns found undcsirnblc to conduct th8dcterminntion by process I, siuce a low phosphorus content necessitntes a snmplc Weight grenter thnii 0 . 2 6. It.mns decided, therefore, to introduce further moaificntions of process I1 so ns to retain the snmplc weight of 0.5 g., but finish at the dilution of graphs In nnd Ib or grnphs IVn and IVb. The changes introduced iu this process 111 are: the dried solid is redissolved in 50 nil. of nitric ncid, d 1.2, an nliquot of 20 ml. tnken, and tlie phospliovniindoniolbydntc complex dew-AFRICAN FISH PRoDUc"s* If* llEE QUANTlTATWE EXTRACTION OF LABORATORY loped. The intensity of colour produced is exnmined cnrefully, nnd the use ofgrnphs In nnd I b with 100 nil. finnl dilution, or graphs IVn and IVh with 50 nil. final dilut,ion, is selected nccordingly. ,The By W. S. RAPSON. (Mi) ? I . M. SCHWARTZ, .ad (ii put) acid coiicentrntion in solutions corresponding to grnphs IVn nnd N. J. VAN RENSBURC i\Iethods bosed on tho preliminary pepsin or nUuli digestion nf tho tiaeue proteina ltnvo beon doveloped for the convoniont, rnpid, and quantitative I v b is double thnt in solutions. relnting to the remaining graphs. The setting wntcr-to-wntcr 1.2 was mnintnined throughout this oxtrnction ofoil snmplea from Bah tivoes in suitable condition and nmount Work, for when n lnrgc nurnber of snmplcs, of widely differing phosfor subwquont nnnlyticnl operations. Theso nm d i a c d in relation phorus content, nrc received, a const,nilt instrument setting is n , to otlier mothods which hnvo been u d for such oil extractiom in ardor distinct ndvnntnge.