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Chapter V. 
23. Development of Matter. (1) Chemical. (2) Formal. (3) Life. (4) Species 
24. Development of Species ; (and concerning Hybrids). 
Chapter VI. 
25. Immortality in the Visible Universe not being attainable for us ; may 
Intelligent beings be hereafter developed in it to a higher life ? 
26. No intelligence here superior to man. (Metaphysics avoided.) 
27. Hence this question is negatived. 
Various hypotheses reyarding matter : — (1.) Greek notion of the Atom. Speculations 
of Lucretius. (2.) Theory of Boscovitch (centres of force). (3.) Theory of 
infinite divisibility. (4.) Vortex-atom theory. Remarks on these theories. 
Relative quantity of matter associated with energy . ) 
Universal gravitation .-—Is a weak force. Two ways of accounting for it. Le Sage s 
hypothesis. 
The Ethereal medium .-—Its principal properties apparently incongruous. Analogy 
of Professor Stokes. Distortion and displacement of ether. Inferior limit of 
its density. Its supposed imperfect transparency. Remarks on ether. 
Remarks on the speculations of this chapter. Modification of the vortex-ring hypo- 
thesis. Possible disappearance of the visible universe. 
Chapter V.— Development. 
Nature of inquiry stated. 
Chemical development : — Changes in lists of elementary substances. Prout s specula- 
tions. Experiments of M. Stas. Family groups. Mr. Lockyer s speculations. 
Olole development .-—Hypothesis of Kant and Laplace. Tendency to aggregation of 
mass. Process cannot have been going on for ever. Peculiarity of products 
developed inorganically. 
Life development : — Morphological and physiological species. Species regarded phi - 
Biologically. Position of a certain class of theologians. Tendency to minoi 
variations. Artificial selection. Natural selection. Unproved point in the 
Darwinian hypothesis. Remarks of Mr. Darwin. Development of the Darwinian 
hypothesis. Mr. Wallace’s views. Professor Huxley’s remarks. Position 
assumed by the authors. 
Chapter VI.— Speculations as to the Possibility of Superior Intelligences 
in the Visible Universe. 
Position of life in the present physical universe. Two kinds of equilibrium. Two 
kinds of machines or material systems. Two respects in which a living being 
resembles a machine. A living being resembles a delicately const ructed machine. 
The delicacy is due to chemical instability. Delicacy of construction derived 
from the sun’s rays. Delicacy of construction in atmospheric changes. Worship 
of powers of nature— mediroval superstitions. Theory which attributes a soul to 
