F, W. Clarke on a new process in Mineral Analysis. 173 
Let us not, however, exaggerate anything, or refuse to re- 
cognize in the too positive ideas which we have just combated 
that portion of truth which they may contain. With this 
purpose let us try, in conclusion, to lay down in few words 
the point at which, in our opinion, in the present state of 
science the important question of the unity of forces: has ar- 
rived, | 
After having for a long time arrested the progress of sci- 
ence by abstract and general considerations upon the phenom- 
ena of nature, the philosophers finished by adopting, with 
Galileo, the experimental method, the only ote that can lead 
with certainty to the discovery of the truth. A rigorous and 
profound analysis, placed at the service of this method, fur- 
nished certain and fundamental results. Reverting to a syn- 
thetic phase, many superior minds now seek by means of these 
tediously and painfully collected materials to reconstruct the 
edifice of which the raising was formerly attempted in vain. 
No doubt science has thus entered upon a fertile course, but 
only on condition of advancing with sure and consequently 
with slow steps. We speak of the unity of force, and of the 
transformation of forces one into the other; but do we know 
what are forces? do we know their nature? We have cer- 
tainly proved transformations of movement, and shown that 
one work may change into another work, mechanical motion 
into heat, and heat into mechanical motion ; these are, wi 
out doubt, the most important points gained by science, and 
enable us to get a glimpse of the existence of a single cause 
manifesting itself in various forms, But*it is a long way from 
this to the discovery of this cause, this single force. Shall we 
some day arrive at it? It is possible and even probable; 
and in this case the name and works of Faraday will always _ 
remain associated with one of the greatest problems which the 
uman mind can entertain. . , 
Arr, XIX.—Contributions to Chemistry from the Laboratory of 
the Lawrence Scientific School.—No. 5. On a new process in 
Mineral Analysis; by Frank WicGLEsworTH CLaRKE, 8.B. 
€@ operation is performed as follows. One part of the 
