260 Proceedings of the Royal Physical Society. 
Lomond in the beginning of January last. The bird was 
sent by Sir James Colquhoun of Luss, Bart., to Mr Small, 
bird-stuffer, for preservation. Bewick's swan is distinguished 
from the other swans by its smaller size, and by the yellow 
spot on the base of the bill, which colour, however, does not 
reach to the nostrils. Irides orange-yellow. Bewick's swan 
does not appear to be common in Scotland, or it may not 
have been distinguished in many cases from the common 
wild swan or Hooper. 
Of the four swans noticed in Britain, two — the Hooper and 
Bewick's swan — have the base of the bill yellow, and the front 
black ; and have the trachea elongated, and a loop of it en- 
closed in the dilated keel of the breast bone. The other two 
— the Mute swan and the Polish — have the base of the bill 
black, and the front yellow, and have apparently no elonga- 
tion of the trachea, and no enclosure of it in the breast bone. 
Wednesday, 27th March 1861. Thomas Strethill Wright, M.D,, 
President, in the Chair. 
The following gentlemen were elected Members of the Society : — 
Mr Hugh Fulton, Deputy Harbour-Master, Granton ; James Struthers, 
M.D., Charlotte Street, Leith ; John Wilson, Esq., Janefield House, 
Duddingston; Alexander Logan, Esq., Teind Office, H.M. General Re- 
gister House. 
As Non- Resident Members : — Robert Logan, Esq., Surgeon, Lanark ; 
and Rev. John Struthers, Minister of Prestonpans. 
The following donations to the Library were laid on the table, and 
thanks voted to the donors : — 
1. The Canadian Journal, New Series, No. XXXI., January 1861. — 
From the Canadian Institute, Toronto. 2. A Lunar Tidal Wave in 
Lake Michigan. Demonstrated by Brevet-Lieutenant- Colonel J. D. 
Graham, U.S. Top. Engineers (with Plates). Chicago, 1860. — From the 
Author. 
The Communications read were as follow : — 
1. Note on the Occurrence of Vanessa polychloros and Cheimatobia bo- 
rearia in Edinburghshire. (Specimens were exhibited.) By R. F. 
Logan, Esq. 
Mr E. F. Logan exhibited two additions to the entomo- 
logy of Mid-Lothian, Vanessa polychloros and Cheimatobia 
horearia, the former a single specimen, taken in a garden 
at Duddingston — the latter found in the larva state, on 
birches, at the base of the Pentlands, in June 1860, and re- 
