No coin nor oath required. For personal study only.
846 C:rnssiiiniiii. The incthod depended upon tlic estiiiiation of t,hc stnblc t u r l d i t y produced by tlic rcnction lictwceii thc rcgctn1)lc tnniiin :ind \vatcr-solriI)Ic urc:iforni:iltlcliytlc coiitlciisatioii products.
On \'cilncsdny nftcrnoon tlic session opciictl witli :t p p c r by JIr. A. 1)oliopc 011 soiiic tliffcrciices lictwmi soh lentliers of slow niitl rnpid tnuiinges. Tt was shown that mpidly tnniicd and filled lcntlicr was initially less pcriiicnlh to watcr tlluli lenthcr tiilllied by S ~O W luetliods. rf, liowcver, thc lentliers wcrc wnslicrl with wntcr and then tested for pcriiienldity, tlieii tlic slow-tanncd sole le:itlier slioivcd the lowcr pcrrncn1)ility. llcnsoiis for t~liis wcrc discussed.
Dr. A. Iiiintael describctl sonic ivorlc ou tlic " glriciug " whicli corild tskc place in lcntlier iiianufnctiirc. !l'liis " glueiug " of films during tiiiiiiiiig Icd to scvcrnl dcfccts which werc dcnioustrntcd I J ~ typical saiiiples of lenther. Ur. A. ;\Iickcrley discusscd tlic coinbination of lignin sulphonic ncids with Iiidc substancc niid its bearing on the use of sulpliitc ccllulosc alone niitl in 1)lciids i n the tanning process.
Tlic fractioiinl cstrnctioii of pine Ixirk wns tho siibjcct of Dr. Yl. Neiiiec's paper, in which hc dcscribcd cspcriiiieiits on low-tcmpcrnture cstrnctioii of tlic bark with n. view to improving tlic taiiiiin/iioii-tniiiiiii ratio. 'l'lie firinl contribution ~vns by Dr. L. Pollnk 011 tlic chcmicnl coiitrol of sonking. Tlic nutlior considered that tlic tlctermiiiatioii of the clissolwd osygcii in the soak could be used ns n iiicniis of control, nnd it soak liquor could )c consitlcred diingcrous wlicii the dissolvcd qsygeii lintl clroppcd to about 0.5 to I .0 iiigiii. per Iitre.
Mr. Van Gijn tliriiiketl nll tliose d i o Iind coiit,ribiitctl to tlic S U C C ~S S of the coiifcrcncc ; A h . G. Colchcu siipportcd, niid Dr. ,I. Gordoii l'nrkcr, on I)cliiilf.of all iiiciiil)crs, thniikcd htr. V:ui Gijii for the n l h iiiiillliCr in wliicli hc lint1 presided over tlic iiiectiiig.
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