_Globe development_— Hypothesis of Kant and Laplace, 160 163 Tendency to aggregation of mass, 161-162 164 Process cannot have been going on for ever, 163 166 Peculiarity of products developed inorganically, 164 167 _Life development_— Morphological and physiological species, 165 168 Species regarded physiologically, 166 170 Position of a certain class of theologians, 167 171 Tendency to minor variations, 168 172 Artificial selection, 169 174 Natural selection, 170 175 Unproved point in the Darwinian hypothesis, 171 175 Remarks of Mr. Darwin, 172 177 Development of the Darwinian hypothesis, 173 177 Mr. Wallace’s views, 174 178 Professor Huxley’s remarks, 175 178 Position assumed by the authors, 176 179 CHAPTER VI. SPECULATIONS AS TO POSSIBILITY OF SUPERIOR INTELLIGENCES IN THE VISIBLE UNIVERSE. Position of life in the present physical universe, 177 180 Two kinds of equilibrium, 178 181 Two kinds of machines or material systems, 179 182 Two respects in which a living being resembles a machine, 180 183 A living being resembles a delicately constructed machine, 181 185 The delicacy is due to chemical instability, 182 186 Delicacy of construction derived from the sun’s rays, 183 186 Delicacy of construction in atmospheric changes, 184 187 Worship of powers of nature—mediæval superstitions, 185 189 Theory which attributes a soul to the universe, 186 190 Real point at issue stated, 187 190 Man presents the highest order of the present visible universe, 188 191 The same idea pervades the Old Testament, 189 192 And it likewise pervades the New Testament, 190-191 193 CHAPTER VII. THE UNSEEN UNIVERSE. Decadence of the visible universe, 192-193 195 Its arrangements apparently wasteful, 194 197 Explanation of this, 195 197 Memory of the universe, 196-197 198 Connection between seen and unseen, 197-198 198 Physical explanation of a future state, 199-201 199 Dr. Thomas Young’s conception of the unseen, 202 200