Gen . Sub . ■ General subjects. 
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The variation of microbes in evidonce of evolution. 
Bourne, G. C. Kleinenberg on the Development of Lojgadorhjndius. 
Q. J. Micr. Sci. xxxviii, pp. 531-546, 
Important discussion of the development of organs by substitution. 
“ The functional activities of newly specialized tissues must always beau 
some relation to the function of the organ which determined their origin, 
and must either support or modify their action In no case of 
substitution are the intermediate steps represented by an indifferent 
germ-layer, but always by a functional and specifically differentiated 
organ.” 
Butler, S. Luck, or Cunning as the main means of Organic Modifi- 
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Claus, C. Lamarck als Begrunder der Descendenzlehre. Wien : 8vo, 
35 pp. 
— -. Ueber die Werthschiitzung der natiirlichen Zuchtwahl als Erk- 
lsirungsprincip, Wien : 8/o, 42 pp. 
Cleland, J. On Rational Teratology. Brit. Med. J., No. 1442, pp. 
346-348. 
Clodd, E. The Story of Creation : a Plain Account of Evolution. 
London : 8vo, 242 pp., 79 figs. 
Conn, H. W. The significance of “ Variety ” and “ Species.” Letter to 
Science, x’, 277, pp. 253 & 251. 
The theory of “Physiological Selection ” [Catchpool, Belt, Conn, 
Romanes]. Species are groups of animals in which variations have 
• largely affected the sexual organs, with sometimes great and sometimes 
little change in other parts of the body. In varieties, on the other hand, 
Variation may have affected any other part of the body to almost any 
degree, but has no" affectel the sexual system. 
c CopE, E. D. Evolution and Idealism. Am. Nat. xxii, pp. 81-84. 
Cox, C. F. Dr. Edward Tyson and the Doctrine of Descent. Letter 
to Science, xi, 270, pp. 169 & 170. 
On the importance of Tyson’s “ Orang-Outang , sive Homo sylvestris” 
1699. 
°Davis, G. Origin of Life, and Species, and their Distribution : a new 
theory. Minneapolis : 12mo, 52 pp. 
°Dexter, R. The Kingdoms of Nature ; or, Life and Organisation, 
from the Elements to the Man. Being a following of matter and 
force into vitality, vitality into organisation, and organisation into 
the various types of being, culminating in Man. Chicago : 1888, 
8vo. 
^Dreyfus, 0. L’Evolution. Paris : 8vo. 
Review, Rev. Sci. xlii, pp. 54-56. 
