372 Proceedings of the British Association. 
tions upon a large scale, which are dependent upon the weather, 
have been frequently and successfully conducted in accordance with 
these rules. He considered the severe frost of 1813-14, which 
continued about twelve weeks, with partial thaws intervening, and 
the severe weather of succeeding winters, with their intermissions, 
to be closely connected with the above rules. The partial rains also 
of very dry summers have been found to take place at the same 
seasons of change, insomuch that for amusement he had frequently 
traced back the periods connected with the age of the moon, from 
the thaws that took place in severe weather, or the rains occurring 
in long continued drought. Residing on the banks of the river, and 
taking much interest in the operations of Professor Whewell respect- 
ing the tides, and his description of these, Mr. Hall stated that he 
had been led closely to compare them with the weather ; but diffi- 
culties to him insurmountable had occurred, when considering the 
variations of weather in different places at the same time ; yet, Te- 
garding those in the neighborhood of Bristol, his conviction was 
unwavering. Perhaps the varying time at which the tide reaches 
various places, so fully described by Professor Whewell in his lec- 
ture on Tuesday evening, might assist in solving this difficulty ; and 
if the attention of others were directed towards it, his end would be 
atta 
Mr. Ettricke then gave a description of “an instrument intended 
to observe minute changes of Terrestrial Magnetism,” and of other 
philosophical instruments. ; 
r. R. Addams then made a communication respecting the vibra- 
tion of bells. 
. Mr. Rootsey then read papers “on the Music of the Greeks, and 
a system of Mnemonic Logarithms.” 
Section B.—Cuemistry anp Mineravoey. 
Dr. Daubeny stated, that he had ascertained that the sublimation 
of carbonate of magnesia was entirely a mechanical process, and he 
inferred that no support could hence be given to Von Buch’s well 
known theory of dolomization. 
Dr. Dalton then gave an exposition of his views upon the subject 
of chemical notation, and the atomic constitution of chemical sub- 
Mr. Johnston explained the use of some chemical tables which 
