368 Proceedings of the British Association. 
this country in which they had become entangled. They were ex- 
tracted from the turpentine whilst it was slowly melting at the 
warehouse, and then placed in spirits of turpentine to cleanse them 
thoroughly. In this way they may be prepared in as great beauty 
and perfection as when newly captured. 
Section E.—Anatomy anp MepIciNeE. 
Dr. Macartney read the report of the Dublin Committee, appoint- 
ed by the British Association, “On the Motion and Sounds of the 
Heart ;” and the report of the London Committee, ‘“ On the Sounds 
of the Heart,” was read by Dr. Clandining. Dr. Symonds then read 
a letter from Dr. Spittal, of Edinburgh, stating, that in consequence 
of the death of Prof. Turner, and the absence of one of the mem- 
bers on the continent, the committee had not been able to prepare a 
report. After that a paper was read “ On the Gyration of the Heart,” 
by F. A. Greeves, Esq. 
The President then read a communication from Dr. Brewster, en- 
titled, “* A singular development of Polarizing Power on the Crys- 
talline Lens, after death,’”’ and also a letter from the same, “On 
Cataract, or a disease resembling Cataract,” which, if resisted in its 
earlier stages, the Doctor believed, from personal experience, might 
be overcome. For detecting this disease, which generally manifest- 
ed itself between forty and sixty, the Doctor gave instructions, and 
further stated, that by attention to diet and regimen, and taking care 
not to study by night, he had been cured in about eight months.’ If 
the affection had not been checked in time, he entertained no doubt . 
it would have ended in cataract. 
Dr. Carson then communicated some ‘Observations on Absorp- 
tion.” 
Section F.—Sraristics. 
A paper on Statistical Desiderata, by W. R. Greg, Esq., of Man- 
chester, was presented by the Rev. E. G. Stanley. 
Mr. Jobn Taylor, Treasurer to the Association, read a paper on 
the comparative value of the mineral productions of Great Britain 
and the rest of Europe. A calculation, he said, was made by Mr. 
C. F. Schmidt, in 1829, of the value of the mineral productions of 
Europe, at continental prices ; and, from the accuracy of the state- 
ments coming within Mr. Taylor’s own knowledge, he was disposed 
to believe in the others. It should be borne in mind that the con- 
