10 Proceedings of Boy al Society of Bdinhuryh. [dec. 5, 
Helmlioltz’s great discovery of the properties of Vortex Motion 
attracted his special attention in 1867 , and led him to the celebrated 
hypothesis of Vortex Atoms. His great paper on Vortices appeared 
in our Transactions, and several lesser, hut important, ones in our 
Proceedings : — such as 
On Maximum Energy in Vortex Motion. 
On the Production of a Coreless Vortex. 
Hext we have his explanation of the apparent attractions and 
repulsions exerted by bodies vibrating in a fluid. 
The effect of wind in raising waves. 
Propagation of ripjdes by surface tension. 
Motion of solids (with or without perforations) in a perfect 
liquid, when the motion is irrotational. 
Stationary waves in running water. 
Ping-waves produced by a single impulse. 
Stability of Fluid Motion. 
Laminar motion in a turbulently moving perfect liquid. 
These form a collection of most important, and entirely novel, 
contributions to Hydrokinetics, which will bear comparison with 
the very best work ever done on the subject. 
It is understood that a great part of this work has arisen indi- 
rectly from Sir W. Thomson’s investigations as to the mechanism of 
the propagation of light, which have been given in outline in the 
Papyrograph of his Baltimore Lectures. 
3. Proposed Additions to the List of Honorary 
Fellows. 
The Chairman, in accordance with Law^ XII., read the following 
list : — 
Ernest Haeckel, Professor of Zoology and Histology in the Uni- 
versity of Jena. 
Pudolph Julius Emmanuel Clausius, Professor of Natural Philo- 
sophy in the University of Bonn. 
Demetrius Ivanovich Mendeleeff, Professor of Chemistry in the 
University of St Petersburg. 
The following Communications were read : — 
