34 1 to nccelcrnto ns tho dccom osition of the guncotton procccdccl ; which wns most irn~kcly to be the cnsc. Further, tho reduction of nitrogan oxides would bo vcry much firentor nt tho rniich higher toiiipcrntiirc of tho Will test. He thought it quite nnturii I thnt tlicrc should lie eqriilibriuni for tho short tirno of n continuoiis test, nntl n t R low tcniperutiiru ns coinpiwed wiih that of the Will test. There wns no rcnl rcnwn whv ciincotton xh011111 not I J ~ in cqniIitiriiini witit its Iirohcis of tlcconiposition nny inorc thnn with niirh nii iiiirtnlilu snbstniicc us copper riitroxyl.
SOTES 0s TIIISIIJIOJIETRY.
BY J. 11. COSTE.
Althongli nicnsiircinciits of tcnipcrntnre forrn piirt of tho work of most chcniicd litborntories it cirxinot 110 said thnt ns n r d o much nttcntion is p i t l t o the siibjeet. A briof conuidcrntioir of sonio poiiits which nro frequently tlisrcgnrclotl niny bu irscfid. l l i u incrcury in glurs therinonieter is usiiully wet1 for loniperntiires witliiii its rnrige, which inny be sitid to be froin -39' to +GOO" C. ctlthougli above, sny, 300" its iisc is not to tm rccurnniended Tho nclvniitngcs of thermoelectric nnd clcctricnl rosistiinco therrnonietcra nrc riot nuch ns to ennblo thein to rcplnco iiiercnry tlicrnioinetcrs for nll kiiitls of work in tliu ordinary Inborntory.
Sinco all thcrnioniuters nru referred to the fiiiicluiiiciititl interonl of tui~i~icriitiirc (F.1.) it is dcsirublc thnt its limits, 'JD" Cristul :lllgluiY. nro tnkcn (1.. 11.. 1V.f from 126 l'rntiouo Clc la "l'iicrniometrib 1889. ~~. co*s Note; on TIicrmometry 1'bil. ~o g : IAX'I. 18!)S, 217. arid (V.) frotti u jirivato communicntioii from JIr. Ilnrry l'oivcll, to ~v h o ~n 1 nni indebted for most of the irifornintion its to English gluss.