EVOLUTION AND HEREDITY. 
Gen. Sub. 9 
Knauthe, K. Zur Frage der Vererbung erworbener Eigenschaften. 
Biol. Centralbl. xi, pp. 57 & 58. 
Cases of fishes. 
. Meine Erfahrungen fiber das Yerhalten von Amphibien und Fische 
gegeniiber der Kalte. Zool. Anz. xiv, pp. 104-106 & 109-115. 
Krebs, W. Augenscheinliche Vererbung eines ererbten Fehlers bei 
Tauben. Verh. Ges. deutsch. Nat. 63 Vers. Bremen (1890) pp. 133 
& 134. 
Kuicenthal, W. On the Adaptation of Mammals to Aquatic Life. 
(Trans.) Ann. N. H. vii (6) pp. 153-179. 
Le Conte, J. The Factors of Evolution. Their Grades and the Order 
of their Introduction. The Monist, i, pp. 321-335. 
1. Pressure of environment ) „ . . . 
_ TT , f fundamental and primary. 
2. Use and disuse ) r J 
3. Natural selection ) .... , . . - ... 
. _ . . , . Y conditioned on sexual modes of reproduction. 
4. Sexual selection ) 
5. Physiological selection, segregate fecundity, or homogamy. 
6. Human evolution — formation and pursuit of ideals. 
Lendenfeld, R. von. The Undying Germ-plasma and the Immortal 
Soul. Mind, lxi, pp. 92-99. 
Marion, A. F. Effet du froid sur les poissons marins. C.R. cxii, pp. 
565-569. 
Merrifield, F. Ou the Conspicuous Changes in the Markings and 
Colouring of Lepidoptera caused by Subjecting the Pupa to different 
Temperature Conditions. Tr. E. Soc. 1891, pp. 155-168, 1 pi. 
Both marking and colouring of the insect may be materially affected 
by altering the temperature in which the pupae are kept. 
Milne-Edwards, A. De l’influence des grands froids de l’hiver sur 
quelques-uns des animaux de la mdnagerie du Museum d’Histoire 
naturelle. C.R. cxii, pp. 201-205. Cf. Rev. Sci.xlvii, pp. 130 & 131. 
Marshall, A. Milnes. Ueber Rekapitulation in der Embryologie. 
(Translation of Presidential Address to Biological Section of Brit. 
Assoc., 1890.) Nat. Rundschau, vi, pp. 1-11, 18-24, 31-36, & 42-47. 
Minot, C. S. On Certain Phenomena of Growing Old. P. Am. Ass. 
xxxix, pp. 271-289. 
Growth (in guinea-pigs) decreases in rate from shortly after birth 
onwards. In the cells protoplasm increases in proportion to the nucleus. 
“ Protoplasm, the physical basis of decrepitude ” ! 
Morgan, C. Lloyd. Animal Life and Intelligence. London : (1890-91) 
8vo, xvi & 512 pp., 40 figs., 1 pi. 
. Nature and Origin of Variations. P. Bristol Soc. vi, pp. 249-273. 
Important discussion of determinate and indeterminate variations. 
