104 Scientific Proceedings, Royal Dublin Society. 
definite line of the spectrum. The existence of double lines is 
attributed to perturbations of these orbits of the nature of apsidal 
motions. 
The bold realisation of events which we are accustomed to- 
associate with the vast cycles of astronomy as occurring within 
orbits too minute and during periods too transient for the mind 
to grasp is characteristic of the writer. 
The recent and powerful method of resnel with which 
the work of Lorentz and of Zeeman has armed physicists is 
every day rendering acknowledgment to this beautiful theory of 
Dr. Stoney’s. 
Dr. Stoney appears to have been one of the first to recognize 
the great importance to science of properly selected units and 
systematic nomenclature. Many of his physical papers contain 
tentative and often valuable suggestions in this connexion. His 
services on the committee appointed by the British Association 
in 1873 are well known. 
In this Report we can only further refer to the very complete 
and profound treatment of the subject of the limits of microscopic 
vision (Phil. Mag. 1896) ; to an important work ‘“ On the Relation 
between Natural Science and Ontology” (Proc. Royal Dublin 
Society, 1890); and, by their titles only, to a long list of 
thoughtful Scientific Memoirs :— 
‘‘QOn an Improved Arrangement of Grove’s Battery.’”’—-British Association 
Report, 1857. 
“On the Adjustments of the Needle of a Tangent Galvanometer’’ (Phil. Mag., 
1858). 
“On the Amount of Direct Magnetic Effect of the Sun or Moon on Insiru- 
ments on the EKarth’s Surface.’’—Phil. Mag. 1861. 
‘¢ Explanation of the Electrical Experiment of Mahomet’s Coftin.’”’—Phil. Mag., 
1868. 
“‘ Approximate Formule for the Volumes and Weights in Gases.’’—Proc. 
Royal Dublin Society, 1880. 
“On the Physical Units of Nature.’’—Proc. Royal Dublin Society, 1881. 
‘On the Energy Expended in Propelling a Bicycle” (jointly with Mr. Gerald 
Stoney).—Trans. Royal Dublin Society, 1883. 
‘“‘On the Cause of the Ividescence in Clouds.’’—Trans. Royal Dublin Society, 
1887. 
