116 
SECOND REPORT- 1832 . 
be requested to continue their observations on the Quantity of 
Rain which falls at different heights. 
That the invitation to investigate fully the theory of the wet 
bulb Hygrometer be renewed. 
That persons who may have oportunities of travelling on 
mountains or of ascending in balloons, be invited to observe 
the state of the Thermometer and the dew point Hygrometer 
below, in, and above the clouds; and to determine how the 
different kinds of clouds differ in these respects. 
That the fourth Sub-section of this Committee be requested to 
procure Reports and Researches to be made on the following 
subjects. 
I. On the connexion of Vaporization with Pressure.—On the 
improvement of the Thermo-barometer as to accuracy and por¬ 
tability.—On the correction for Humidity in the barometrical 
measurement of heights. 
II. On the improvement of Thermometers for rendering them 
sensible to minute impressions of radiant heat.—On the alleged 
Polarization of Heat.—On the effect of transparent Screens 
upon Heat. 
III. On the phenomena considered as opposed to the undula- 
tory theory of Light.-—On the improvement of the Achromatic 
Telescope. 
Committee for Chemistry, &c. 
The Committee recommend,—That Dr. Dalton and Dr. 
Prout be requested to institute experiments on the specific 
gravities of Oxygen, Hydrogen and Carbonic Acid, and to 
communicate their results to the next Meeting. 
That Dr. Turner be requested to extend his researches into 
the atomic Weights of the elementary bodies, and to report to 
the next Meeting, on the progress recently made in this branch 
of chemical science. 
That Mr. Johnston be requested to report to the next 
Meeting, on any additional evidence which may be deduced 
from his own experiments, or those of others, in support of the 
new theory of the Sulphur Salts. 
That Professor Miller be requested to determine the form 
and optical characters of those Crystallized Bodies which have 
not been examined by Mr. Brooke and Mr. Levy, and that 
Chemists he invited to send him specimens of perfect artificial 
Crystals. 
That the Rev. Wm. Whewell, Mr. Brooke, Professor Miller, 
and Dr. Turner be requested to cooperate in prosecuting and 
