XOTES.
535
I the siiiiplcst, (luiclirst and iiiost exact maiiiier according to Sections 71 and 72 of tlic geiieral inining police o r t h . Jaiiuary 18, 190of 0, the Royal IIea(l \lining Office, I:rcslau. ‘l’lic apparatus scrres further ior thc (leterinination of methaiir i n the high nitrogenous gases which arc foiml in milie inflaiiimator~gases. It is also quick alii1 accui-at? for determiiiing their content of carbon monoxiile. F. sc111~1~1131
