Chemistry and Physics. 309 
ferric oxide by carbonic oxide, by hydrogen and by carbon re- 
c 
tion of carbon, hydrogen, and carbonic oxide with sixteen grams 
of oxygen are taken as 47°78, 57°82 and 68°35 respectively. The 
effect of the different physical states both of the metallic oxides 
and of the charcoal used is likewise carefully discussed. 
nh connection with the above paper, Mr. M. M. Pattison Muir, 
of Caius College, Cambridge discusses the “influence exerted b 
time and mass in certain reactions in which insoluble salts are 
produced.” The author following a previous suggestion of Glad- 
pipet 4 
ally becomes more and more slow.” 2, “that the equation 
CaCl, +M,CO,=2MCIi+CaCoO, 
does not furnish a full expression of the action of sodium or po- 
tassium carbonate upon calcium chloride. en the two salts 
are mixed in the proportion expressed by their respective formule, 
4, 
w f 9 
that elevation of temperature tends to increase and on the other 
d increase the excursions of the 
our. Scl.—Turrp Series, Vou. XV, No. 88.—APRIL, 1 
21 
