XXIV 
FIFTH REPORT —1835. 
2. That British chemists be invited to make experiments for 
removing the doubts respecting the proportions of Oxygen, 
Azote, &c., in the Atmosphere ; for determining the proportions 
of Azote and Oxygen in Nitrous Gas and Nitrous Oxide ; and 
for more accurately investigating the specific gravity of the com¬ 
pound gases in general. 
3. That the sum of 25/. be placed at the disposal of the Rev. 
W. Y. Harcourt for the further prosecution of experiments on 
the effects of long-continued heat upon rocks, minerals, and 
other substances*. 
4. That Dr. Turner f be requested to extend his researches 
into the Atomic Weights of the elementary bodies, and to re¬ 
port on the progress recently made in this branch of chemical 
science. 
5. That Professor Johnston be requested to undertake a se¬ 
ries of experiments into the comparative analysis of Iron in the 
different stages of its manufacture. 
6. That Professor Johnston be requested to extend and re¬ 
vise his table of Chemical Constants, and that the sum of 20/. be 
placed at his disposal for that purpose. 
7. That an examination be made into the nature and quantity 
of the gases given off from Thermal Waters, whether there be any 
variation in these respects according to season of the year, hours 
of the day, or condition of the atmosphere; and whether there 
be any changes of temperature in the same waters. 
8. That the Gaseous Products which are discharged from the 
chimneys of smelting and other furnaces and fireplaces, be ex¬ 
amined, at various periods of the operations carried on in them, 
with a view of ascertaining the compounds which are formed 
when the processes are most successfully conducted, and also 
of detecting the existence of compounds which may perhaps be 
new or valuable. 
9. That a Committee be appointed to report their opinion as 
to the adoption by British chemists of an uniform system of 
Chemical Symbols^. 
10. That an extension of the researches commenced by Sir 
David Brewster into the optical properties of Minerals be re¬ 
commended to the attention of chemists. 
11. That Mr. Graham be requested to submit to further in¬ 
vestigation the amount of security to be derived from the Safety- 
lamp, and the means of improving it. 
* For a report of experiments instituted by Mr. Harcourt, in Yorkshire, at 
the Low Moor Iron Works, and at the Elsecar Furnace, see vol. iii. 
f For a notice of the researches of Dr. Turner, see vol. ii. p. 399. 
% For this report, see vol. iv. p. 207. 
