FOWLER & CLIFFORD-RESIDEAL PRODUCTS FROM SEWAGE. 815-' of t~i o iiydrnzino salt iwing intlicntccl by tlic ~u a rnulyl~clc.ni~nr sub-oxitlo colour. Tho nction i n t h o c n m (110. \'.) tlopnds on tho rivlircibility of tliso olonicnl. to uxitim of thu typee SIO or NO, which re-ositlina to 110, on rohtnct with chlorntou, otc. J1olyl)d;c ncid ir rctlircd by nny I r y b z i n o coinpouncl to 1110 blue suboxitlu. A ~33 col. solution of hyclrogcn ~~!rositlo is npprcntly i r n n f l a t d by liydrnzino nitrnto. Cop wr nntl iron immetlintcly on contnct sot u p nn nction w d t nlknli nw~y.lclnts ic Manchester Sect ion. London Section. I sorm ox THE coiiPosIwm OF SUSDRY JtESIDUAL PRODUCTS FllOJI SIS\\'ACE
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