308 
PROCEEDINGS OF SECTION B. 
80 grammes of ammonium nitrate give 44 grammes of nitrous oxide 
80 grammes of ammonium nitrate give 62*14 x 
oxide at 15° C. and 740 mm. 
f ^ litres of nitrous 
740 
30 grammes of ammonium nitrate give 62*14 
nitrous oxide at 15° C. and 740 mm. 
X 
288 30 
740 80 
litres of 
30 grammes of ammonium nitrate give 9*069 litres of nitrous oxide 
at 15° C. and 740 mm. 
9*069 litres. Ans. 
It will be seen that this formula V = 62 14 x 
T 
P 
lends itself con- 
veniently to tlie use of logarithms whereby the labourjof multiplication 
and division is obviated. Log. 62*14 = 1*79337. 
15.— SOME EEMAEKS ON THE TEACHING OF ELEMENTAEY 
CHEMISTEY. 
By A. J. S ACH, Goulburn. 
