eteen, he had projected a treatise on the philosophy of mind, in
which he proposed to give a physiological interpretation to the doctrines
of Reid, Stewart and Brown. At the age of twenty he gave a course of
lectures on this subject; and to this line of thought he held ever after.
One of the influences which led to his departure from a strict
interpretation of the Scotch metaphysicians was the influence of Spinoza.
As indicating the eagerness with which he pursued his studies in all
directions, and the earnestness of his purpose at so early an age, his own
account of a club he attended at this time [Footnote: Fortnightly Review,
April 1,1866, introductory to the article on Spinoza.] may be mentioned. In
this account he describes a Jew by the name of Cohen, who first introduced
him to the study of Spinoza, and who has mistakenly been supposed to be the
original of Mordecai in _Daniel Deronda_.

The sixth member of this club, who "studied anatomy and many other things,
with vast aspirations, and no very definite career before him," was Lewes
himself, in all probability. His eager desire for knowledge took him to
Germany in 1838, where he remained for two years in the same desultory
study of many subjects. He became thoroughly acquainted with the German
language and life, and gave much attention to German literature and
philosophy. On his return to England, Lewes entered upon his literary
career, which was remarkable for its versatility and productiveness. In
1841 he wrote "The Noble Heart," a three-act tragedy, published in 1852.
His studies of Spinoza found expression in one of the first essays on the
subject published in England. In 1843, he published in the _Westminster
Review_ his conclusions on that thinker. His essay was reprinted in a
separate form, attracting much attention, and in 1846 was incorporated into
a larger work, the result of his studies in Germany and of his interest in
philosophy. In 1845, at the age of twenty-nine, he published a history of
philosophy, in which he undertook to criticise all metaphysical systems
from the inductive and scientific point of view. This work was his
_Biographical History of Philosophy_. It appeared in four small volumes in
Knight's weekly series of popular books devoted to the diffusion of
knowledge among the people. Lewes touched a popular demand in this book,
reaching the wants of many readers. He continued through many years to
elaborate his studies on these subjects and