139 
March 14-th , 1881.—“ On Some Curious Forms of Fresh-Water 
Mollusca from Lake Tanganyika, Central Africa,” by James Cosmo 
Melvill, F.L.S. 
March 22nd, 1881 . — “On the Growth and Use of a Symbolical 
Language,” by M. Hugh Me. Coll, B.A. Communicated by the 
Rev. Robert Harley, M.A., F.R.S. 
Four Letters of the late Mr. Thomas Carlyle, addressed by him 
to the late Mr. Samuel Bamford, of Blackley, the author of “ Pas- 
sages in the Life of a Radical.” Communicated by E. W. Binney, 
F.R.S., F.G.S., President. 
March 29th, 1881 . — “ On the Motion of Developable Cylinders,” 
by James Bottomley, D.Sc., F.C.S. 
April 5th, 1881 . — “On Du Bourguet’s ‘Calcul’ and on Terna- 
ries,” by Sir James Cockle, F.R.S., Corresponding Member of the 
Society. 
“ On a Eucalyptus Globulous at Douglas, Isle of Man,” by E. 
W. Binney, F.R.S., F.G.S., President. 
“Note on the Presence of Arsenic in Paper Hangings,” by 
Harry Grimshaw, F.C.S. 
“ On the Action of Sulphuric Acid from Gas Lights on a Zinc 
Plate,” by J. P. Joule, D.C.L., LL.D,, F.R.S., <fcc. 
“ On the Relation between the Electrical Resistance and Chemi- 
cal Constitution of Steel Wire,” by William H. Johnson, B.Sc. 
Several of these papers have already been printed, and 
others passed by the Council for printing in the new Volume 
of Memoirs. 
The Council still consider it desirable to continue the 
system of electing Sectional Associates, and a resolution on 
the subject will be submitted to the Annual Meeting for the 
approval of the Members. 
The Librarian reports that the number of societies with 
which we correspond is nearly the same as last year, and 
that Vol. VI., 3rd Series, of our Memoirs, and Vols. 16 to 
19 of the Proceedings, have been forwarded to these societies 
and to all our honorary and corresponding members. In 
the case of the societies the volumes were accompanied with 
requests to fill up vacancies where required, and in reply we 
have received many volumes to complete our sets. 
