ADDRESS BY PROFESSOR TRAILL. xxi 
by Professor Forbes—from which it appears that the horizontal inten- 
sity diminishes = ,/,, of the whole, for every 3000 feet of vertical ascent ; 
On the quantity of Rain falling at different heights above the surface of 
the Ground, made at York, by Professor Phillips, and Mr. Gray ; On 
the determination of the mass of the planet Jupiter, by the Astronomer 
Royal; On the Horary Variations of the Barometer, Thermometer, 
Hygrometer, and Whewell’s Anemometer, by Mr. Snow Harris—part of 
which has already appeared, and of which the sequel will be laid before 
this annual Meeting; On the Duty performed by Cornish Steam En- 
gines, by Mr. Enys; On the Ratio of the Resistance of Fluids to the 
Velocity of Waves, by Mr. Russell and Mr. Robison—of which we ex- 
pect to receive an account on this occasion. 
We may also be permitted here to allude to some highly-interesting 
investigations, still in progress, under the auspices of the Association, 
such as—Observations on the Temperature of Springs and Deep Mines, 
by Instruments procured and verified by the Meteorological Council, 
which are already placed in various districts of Great Britain and Ire- 
land, and also in Peru, under the direction of our scientific associate, 
Mr. Pentland, from which results most interesting to Geology are an- 
ticipated ; On the Temperature of the strata at different depths near 
Edinburgh, by Professor Forbes, for ascertaining the rate of the trans- 
mission of Solar Heat downwards; A continuation of Mr. W. Vernon Har- 
court’s experiments on the effects of long-continued Heat on Rocks and 
other bodies ; Experimental Investigations into the Fabrication of Glass, 
by the same gentleman and Dr. Faraday; A Systematic Catalogue of 
all the Organized Fossils of the British Islands, by Professor Phillips ; 
An Experimental Determination of the Strength and other Mechanical 
Properties of Iron obtained by the Hot and Cold Blasts, undertaken by 
Messrs. Hodgkinson and Fairbairn; Analysis of Iron in the different 
stages of its manufacture, and an Extension of the Tables of Chemical 
Constants, by Professor Johnston; Statistical Returns of the State of 
Education in our great towns ; An Examination of the Statistical docu- 
ments preserved in the India House, by Professor Jones; besides the 
discussion of numerous very interesting contested points in Natural 
History and in Medicine. 
These are satisfactory evidences of the activity of the Association ; 
_ but it bas not scrupled also to afford pecuniary assistance, when such 
_ aid appeared requisite to ensure success. It is true, that the moderate 
sum, payable on admission into the Society, seems more suited to the 
_ finances of the majority of philosophers, than to the support of ex- 
