PROCEEDINGS OF SECTION A. 371 
The significance of the parallelism in the values of these two 
quantities cannot be discussed in this abstract. The law of Z has 
thus been found, and as 7 is proportional tu 4, we have the law of 
Am in 3An’ //* the expression for molecular force. 
In extending the theory to inorganic bodies with data at 
present available it is necessary to construct a theory of the 
capillarity and compressibility of solutions ; this is successfully 
done with the unfolding of some interesting results in the 
process, and the same parallelism between dynic equivalent and 
molecular refraction is again established for a large number of 
elements. Many matters are treated of in the full investigation 
which cannot be touched on in this abstract. 
7.—REMARKS ON THE ARRANGEMENT OF A 
GALVANOMETER. 
By E. F. J. Love, M.A., Fellow of Queen’s College, Melbourne, 
and Assistant Lecturer and Demonstrator in Natural Philosophy 
to the University. 
| Adstract. | 
THE author of this paper described a ballistic galvanometer, the 
suspension and mounting of which offered some peculiarities. 
The suspended system of magnets was made as nearly astatic as 
possible, and the restoring force was supplied by the torsional 
rigidity of the suspending fibre. For the latter, the author 
employed dark human hair, of suitable length, mounted in its 
natural state without cleansing. This substance he found to 
possess very perfect torsional rigidity, and to be nearly free from 
“elastische nachwirkung.” It was recommended that all 
delicately-suspended apparatus should be mounted on india-rubber 
pillars, of height equal to their diameter, as such a mounting 
almost completely insulates the apparatus from external 
disturbance, and, at the same time, rapidly takes up and damps 
vibrations actually set up within the instrument. The paper 
further contained a comparison of the merits of Gauss’s method 
of observing by means of telescope and scale with those of Sir 
W. Thomson’s lamp and scale method, the conclusion being 
strongly in favour of the former for absolute measures of angle, 
and concluded by describing a simple method of constructing 
circular scales. 
8.—AIDS TO CALCULATION. 
By J. J. Fenton. 
