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iv 
Note on Professor Bain’s Theory of Euclid I. 4. By Wm. 
Robertson Smith, M.A., Assistant to the Professor of 
Natural Philosophy. Communicated by Professor Tait, 176 
A Simple Mode of xApproximating to the Wave-Length of 
Light. By W. Leitch, Assistant to the Professor of 
Natural Philosophy in the University of Glasgow. 
Communicated By Professor Tait, . * . 179 
Note on Linear Partial Differential Equations. By Professor 
Tait, . . . . . . 190 
On the Oxidation Products of Picoline. By James Dewar, 
F.R.S.E., Lecturer on Chemistry, Yeterinary College. 
Edinburgh, • \ 192 
Notes of some Experiments on the Rate of Flow of Blood 
and some other Liquids through tubes of narrow 
diameter. By J. Matthews Duncan, M.D., F.R.S.E., 
and Arthur Gamgee, M.D., F.R.S.E., . . 193 
On Cystine (CLT 7 N0 2 S). By James Dewar, F.R.S.E., 
Lecturer on Chemistry, Yeterinary College, Edinburgh, 
and Arthur G-amgee, M.D., F.R.S.E., Lecturer on 
Physiology, at Surgeon’s Hall, Edinburgh, . .201 
Notes from the Physical Laboratory of the University. By 
Professor Tait. (With a Plate), . . . 206 
Donations to the Society, . 209 
