British Association. 297 
to measure with the greatest accuracy the amount of reduction which takes 
place by the action in a given time. 
“ On Musical Sounds produced by Carbon.”’ By Dr F. L. Puirson.— 
The author has found that a fragment of homogenous wood charcoal, 
about a foot long and an inch thick, suspended by a string, and struck 
with a hammer, emits a beautiful musical sound, resembling that given 
out by glass and aluminium. 
‘¢On New Zealand Lignites.” By Dr Murray THomson. 
‘On the Chemical and Physical Principles in Connection with the 
Specific Gravity of Liquid and Solid Substances.” By Dr Orro Ricurer. 
Mr W. Symons exhibited a new form of Gas Battery. 
“On Oxidation by Ozone.” By Dr T. Woop. 
“On the Manufacture of Superphosphates, and Dissolved Bones.” By 
Dr 8. Macapam. 
‘Recent Applications of the Hydrocarbons derived from Artificial and 
Natural Sources.” By Dr B. H. Paut. 
“On the Uses of Fuel in Marine Boilers.” By Dr Ricuarpson and 
Mr T. W. Bunnine.—It being understood that mixtures of Hartley and 
Welsh coal were being burnt on board the Imperial navy in France, some 
experiments were recently tried in the Government Yard in this country 
upon those mixtures. Dr Richardson and Mr Theo. W. Bunning were 
deputed to be present on the occasion. In order to register the amount 
of the smoke, which had hitherto been considered the chief disadvantage 
in the use of the Hartley coal, they adopted a series of figures to repre- 
sent the different intensities of the smoke. Under this arrangement, it 
was found that while the “ Hartley’? made 340 marks of smoke and the 
“ Welsh” 40, an equal mixture of the Hartley and the Welsh made only 
one mark. That was, there was only smoke of the lightest description 
issuing from the chimney for one minute, during the whole of the experi- 
ments, which lasted six hours. The coal was burnt in an ordinary boiler, 
used for making experiments on the different cargoes of coals applied to 
the yard; the coals were stoked by an ordinary Government stoker with- 
out any precautions, and the doors were of the usual closed description 
-employed in Her Majesty’s Navy. The result of this application would 
be to furnish a remedy for the great nuisance of smoke whicli existed in 
all ocean-going steamers, and a great saving wouid at the same time be 
effected. 
‘On Impurities in Lead.” By Dr Zenner. 
‘“‘Sur les procédés de gravure du verre a lide de lacide fluor- 
hydrique par impression de la réserve.”” By M. L. Kessizr. 
‘Sur des appareils nouveaux evaporant 4 multiple effet et a air 
libre nommés Hrorateurs.” By M. L. Kessurr. 
“Sur les avantages commerciaux d’un nouveau sel de soude cristallisé.” 
By M. L. Kesstzr. 
‘¢On Photelectric Engraving, and Observations upon Sundry Processes 
of Photographic Engraving.” By Mr Duncan C. Datuas. 
‘¢ Are Nitrogen and Carbonic Oxide the Oxide of Carbon in different 
Allotropic or Isomeric states?’”? By Mr H. Kizeovr. 
“Report on Synthetic Researches on the Formation of Minerals.” 
By Mr Atruonse Gaczs. 
‘‘On the Minerals and Salts found in Coal Pits.’’ By Messrs R. C. 
CrapHam and J. Daguisu. 
