49 
A paper was read entitled “ Jeremiah Horrox and William 
Crabtree, the Observers of the Transit of Yenus in 1639,” 
by Mr. John E. Bailey, F.S.A. 
Mr. Bailey also exhibited the rare work of Hevelius 
entitled Mercurius in Sole visits Gedani 1661 , printed at 
Dantzic in 1662. 
Ordinary Meeting, February 6th, 1883. 
Professor Balfour Stewart, LL.D., F.RS., in the Chair. 
Among the donations announced were medallion portraits 
of Mr. George Walker, one of the Founders of the Society, 
and Mrs. Walker, presented by the President and other 
members of the Council. 
On the motion of Mr. Baxendell, seconded by Mr. Bailey, 
it was resolved, “ That the thanks of the Society be given 
to the President and other members of the Council for the 
portraits of Mr. George Walker and Mrs. Walker, presented 
by them to the Society.” 
“ Note on the Yapours of Incandescent Solids,” by Henry 
Wilde, Esq. 
It is generally admitted that the phenomena known as 
Moser’s Spectral Images, which make their appearance on 
polished metallic surfaces when bodies are placed very close 
thereto, are attributable to the general property which solid 
bodies possess of giving off vapours of their own substance 
at common temperatures, and the peculiar odours emitted 
by some of the less volatile metals, such as copper, when 
subjected to friction or to the action of cutting tools, are 
also assignable to the like cause. 
The production of Moser’s images, as has been shown, is 
greatly assisted by the application of heat, and it might 
