Part

 1 Int|       and wished to devote his life to the study of physics;
 2 Int|      twenty-three years of his life filling the chair of physics
 3 I  |       all the relations of the life of civilised nations; they
 4 I  |        riches, of enjoyment of life, of the preservation of
 5 I  |       to deny, that the mental life of individuals and peoples
 6 I  |       establish. But in mental life, the influences are so interwoven,
 7 I  |   peaceful course of civilised life remain unawakened.~It is
 8 III|       see how it occurs in the life of plants; it can also be
 9 IV |      operations at work in the life of the earth and of the
10 IV |       fuel which the vegetable life yields, whether it be the
11 IV | whether it be the still active life of the surrounding vegetation,
12 IV |     vegetation, or the extinct life which has produced the immense
13 IV |     earth's atmosphere, on the life of plants in general, and