WHAT IT IS AND WHAT IT IS NOT. 59 
cause human observation and logic can be only partial, 
no law of life can be fully stated. Because the processes 
of the human mind are human, with organic limitations, 
the study of the mind itself becomes a 
part of the science of bionomics, For 
it is itself an instrument or a combination of instruments 
by which we acquire such knowledge of the world out- 
side of ourselves as may be needed in the art of liv- 
ing, in the degree in which we are able to practise 
that art. 
The necessary sequence of events exists, whether we 
are able to comprehend it or not. The fall of a leaf 
follows fixed laws as surely as the motion of a planet. 
It falls by chance because its short movement gives us 
no time for observation and calculation. It falls by 
chance because, its results being unimportant to us, we 
give no heed to the details of its motion. But as the 
hairs of our head are all numbered, so are numbered 
all the gyrations and undulations of every chance au- 
tumn leaf. All processes in the universe are alike nat- 
ural. The creation of man or the growth of a state 
is as natural as the formation of an apple or the 
growth of a snow bank. All are alike supernatural, 
for they all rest on the huge unseen solidity of the uni- 
verse, the imperishability of matter and the immanence 
of law. 
We sometimes classify sciences as exact and inexact, 
in accordance with our ability exactly to weigh forces 
and results. The exact sciences deal with simple data 
accessible and capable of measurement. The results of 
their interactions can be reduced to mathematics, Be- 
cause of their essential simplicity, the mathematical sci+ 
ences have been carried to great comparative perfection, 
It is easier to weigh an invisible planet than to measure the 
force of heredity in a grain of corn. The sciences of life 
Meaning of law. 
