514 Proceedings of the British Association. [October, 
prevent this oxidation, even when mixed with a large proportion of fatty oils. 
Twenty per cent rape oil gave no indication of heat at 17° F. 
Precipitation of Silver by Copper.—Mr. Alfred Tribe contributed a paper of 
great interest on this subject, stating that silver precipitated from its nitrate 
solution by copper always contained the latter metal. The presence of the 
copper he considered due to the dissolved oxygen in the silver solutions, or to 
the absorption of that gas from the air by the produced copper-nitrate during 
or subsequent to the precipitation. 
Dust from Vesuvius.—Mr. George Gladstone, F.C.S., stated that analysis 
of the dust thrown up by Vesuvius during the recent eruption proved it to 
consist of aggregations of crystallised quartz, dotted over with the magnetic 
oxide of iron. By boiling the sand in hydrochloric acid the whole of the iron 
is removed. None of the samples contained titanium. 
Chemical Nomenclature.—Dr. A. Crum Brown read an interesting paper on 
chemical nomenclature, to which in an abstract we could not do full justice. 
SECTION C.—GEOLOGY. 
President.—R. A. C. Godwin-Austen, F.R.S., F.G.S. 
Vice-Presidents.—Thomas Davidson, F.R.S., F.G.S.; Prof. P. Martin Dun- 
can, M.D., F.R.S., F.G.S.; Rev. Thomas Wiltshire, M.A., F.G.S.; Prof. J. 
Phillips, M.A., LL.D., F.R.S.; J. Prestwich, F.RS. 
Secretaries—Henry Woodward, F.G.S.; Louis C. Miall; George Scott ; 
William Topley, F.G.S. 
The President, in his Address, dwelt upon the richness in interest of the 
county of Sussex to the geological observer, upon the place of the fresh- and 
brackish-water formations on the geological scale, and upon the Wealden 
formation, especially the Wealden formation of the European surface. 
Prof. Phillips proposed and Prof. Hull seconded a vote of thanks to the 
President. 
The principal papers read in this Section were as follows :—‘t The North- 
East of Ireland,” by Prof. Hull, F.R.S.; ‘* The Geology of the Neighbourhood 
of Brighton,” by Mr. James Howell; ‘‘ The Sub-Wealden Exploration,” by 
Mr. W. Topley, F.G.S.; ‘*On the Distribution of Goitre in England,” by Mr. 
G. A. Lebour, F.G.S.; ‘‘ On the Discovery of a Zeuglodon in the Beds of the 
Eocene Formation,” by Mr. H. G. Seeley; ‘‘On the Investigation of Plates 
of Coral from the Mountain Limestone,’’ by Mr. J. Thomson, F,G.S.; ‘On 
Brachiapoda,” by Mr. Thomas Davidson; ‘‘ Report on Fossil Crustacea,” by 
Mr. H. Woodward, F.G.S.; and a paper ‘‘On the Prospec& of Finding Pro- 
ductive Coal-Measures in Norfolk and Suffolk,” by Mr. John Gunn. All these 
paper contain too much detail to admit of useful abstraction. 
SECTION D.—BIOLOGY. 
President.—Sir John Lubbock, Bart., M.P., F.R.S. 
Vice-Presidents.—Prof. Balfour, M.D., F.R.S.; John Ball, F.R.S.; John 
Beddo, M.D.; George Bentham, F.R.S.: J. Cordy Burrows, M.D.; T. Spen- 
cer Cobbold, M.D., F.R.S.; Prof. Flower, F.R.S.; Col. A. Lane Fox, F.G.S.; 
Dr. Hooker, C.B., F.R.S.; J. Gwyn Jeffreys, F.R.S.; J. Burdon Sanderson, 
M.D., F.R.S.; Prof. Wyville Thomson, M.D., F.R.S. . 
Secretaries.—Prof. Thiselton-Dyer; H. T. Stainton, F.R.S.; F. W. Rudler, 
F.G.S.; J. H. Lamprey; Dr. Gamgee, F.R.S.; E. Ray Lankester; Dr. Pye 
Smith, F.R.S. 
The President opened the proceedings by reading the usual Address. He 
pointed out the place that natural science should occupy in the curricula of 
the schools, and then went on to say that the Darwinian theory of the Origin 
of Species was much misunderstood. Mr. Darwin had called attention to a 
vera causa, had pointed out the true explanation of certain phenomena; it 
was quite another thing to assume, as was too often done, that all animals 
