222 FRAGMENTS OF SClENCti. 
and more refrigerated. The light vapor floating around 
the surface so cooled is condensed upon it, and there 
accumulates to form the little pearly globe which we call a 
dewdrop. 
Thus the boy finds the simple and homely fact which 
addressed his senses to be the outcome and flower of the 
deepest laws. The fact becomes, in a measure, sanctified 
as an object of thought, and invested for him with a beauty 
for evermore. He thus learns that things which, at first 
sight, seem to stand isolated and without apparent brother- 
hood in Nature are organically united, and finds the 
detection of such analogies a source of perpetual delight. 
To enlist pleasure on the side of intellectual performance 
is a point of the utmost importance; for the exercise of the 
mind, like that of the body, depends for its value upon the 
spirit in which it is accomplished. Every physician knows 
that something more than mere mechanical motion is com- 
prehended under the idea of healthful exercise that, 
indeed, being most healthful which makes us forget all 
ulterior ends in the mere enjoyment of it. What, for 
example, could be substituted for the action of the play- 
ground, where the boy plays for the mere love of playing, 
and without reference to physiological laws; while kindly 
Nature accomplishes her ends unconsciously, and makes 
his very indifference beneficial to him. You may have 
more systematic motions, you may devise means for the 
more perfect traction of each particular muscle, but 
you cannot create the joy and gladness of the game, and 
where these are absent, the charm and the health of the 
exercise are gone. The case is similar with the education 
of the mind. 
The study of Physics, as already intimated, consists of 
two processes, which are complementary to each other 
the tracing of facts to their causes, and the logical advance 
from the cause to the fact. In the former process, called 
induction, certain moral qualities come into play. The 
first condition of success is patient industry, an honest 
receptivity, and a willingness to abandon all preconceived 
notions, however cherished, if they be found to contradict 
the truth. Believe me, a self-renunciation which has 
something lofty in it, and of which the world never hears, 
is often enacted in the private experience of the true votary 
of science. And if a man be not capable of this self-renun- 
