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Tlio sulwqiiciit papcrs wcrc tliridcd into four groups. 'l'liu lirst of ~IICSC, ihiling wit11 tlic soil nioisturc, w:is opcnctl by ATr. 11. 21. 1Ccc11, of ltotl~:inistcd, with :I pnpcr on l'lic Systcni : Soil-Soi! Aloistllrc.JJ Work 011 this subject W:W c~~it.ic:~lly r c ~~c \ r c d , niid tho r:irioiis divisions into wliicll soil nioisturo 1i:ii.c liccn c1:issilicd wcrc disciiswd i n the light s: nioclcrn ricns 011 tho constitution of t l ~c soil. 11.10 16lc of soil colloids i n bringing nboiit n progrcssiro gr:id:ition i i i tlic stntcs of soil nioistilrc, i i i coiitrnst to tlio clcnr-cut divisions forniorly iii~ngi~~ctl , wns csplniiicd, tlio r:);ioiis cocliiciciits siicli ns ' I nioistiirc coollicicnt, I ' \vilting co-
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niucli nhorc looo C. Wool arid cotton arc rotted 1)s tlie condciisiition of :icid, if tlie tcnipcriiturc of tho giis frills below tho dc\v-point. 111 sonie c:isc~, ncitl fnnics iiro noutriiliscd with limo or zincositlo dust Iicforo being Jiltcrcd. Shnrp, yritty piirticlcs cut tho biirs. I'iltcr riin