is written in a plain descriptive style, containing many interesting
accounts of scenery and adventure, explanations of the methods of study of
animal life at the seashore, how experiments are carried on, the results of
these special studies, and much of controversy with other observers. It
combines science and description in a happy manner. Another result of his
physiological studies was a paper "On the Spinal Cord as a Centre of
Sensation and Volition," read before the British Association for the
Advancement of Science, in 1858. This was followed the next year by three
published addresses on "The Nervous System," in which he presented those
theories which were more carefully developed in his latest work, where he
gave a systematic account of his philosophy. From this time on to his death
the greater part of his energies were given to these studies, and to the
building up of a philosophy based on physiology. A popular work, in which
many of his theories are unfolded, and marked throughout by his peculiar
ideas in regard to the relations of body and mind, was published in 1858.
This was his _Physiology of Common Life_, a work of great value, and
written in a simple, comprehensive style, suited to the wants of the
general reader. In the first volume he wrote of hunger and thirst, food and
drink, digestion, structure and uses of the blood, circulation of the
blood, respiration and suffocation, and why we are warm and how we keep so.
The second treats of feeling and thinking, the mind and the brain, our
senses and sensations, sleep and dreams, the qualities we inherit from our
parents, and life and death. In 1860 he printed in _The Cornhill Magazine_
a series of six papers on animal life. They were reprinted in book form in
1861, under the title of _Studies in Animal Life_. More strictly scientific
than his _Seaside Studies_, they were even more popular in style, and
intended for the general reader. While these books were being published he
was at work on a more strictly scientific task, and one intended for the
thoughtful and philosophic reader. This was his _Aristotle: a Chapter from
the History of Science, including Analyses of Aristotle's Scientific