THEORY OF EVOLUTION. 
Gen . Sub. 15 
Platner, G. [See Oogenesis]. 
The rapid growth of ova in hermaphrodite gland of Arion is the 
natural result of the direct supply of abundant food ensured by their 
peripheral position. 
Plauts Considered in Relation to their Environment. Nature, xxxiii, 
pp. 607-609. 
Poulton, E. B. Colour Relation between Larva of Smerinthus ocella- 
tus and its Food-plants. P. R. Soc. xl, pp. 135-173. 
Colour of larva determined .(1) by hereditary influence, (2) by the 
colour of the leaf upon which it lives, and not by the substance of the 
leaf when eaten, (3) by individual variation with similarity oE parent- 
age, conditions, &c. 
. Colour of Pupae. Tr. E. Soc. 1886, pp. 46-48 ; J. R. Micr. Soc. 
1887, 74 pp. 
The surrounding colour either affects some terminal organ, or more 
diffusely some superficial element in the larval tissues. 
Preyer, W. Bewegungen der Seesterue. MT. z. stat. Neap, vii, 
pp. 27-127, 27 cuts. 
Inter alia — Influence of various re-agents, drugs, &c., on movements of 
Star fishes. 
Regnard, P. Action des hautes pressions sur les tissus animaux. C.R. 
cii, pp. 173-176. 
Rcedel, H. Ueber die untere Temperaturgrenze bel welcher niedero 
Thiere noch existiren konnen. Jen. Z. Nat. lix, pp. 183-214 ; J. R. 
Micr. Soc. 1887, p. 52. 
Resistance to cold (in Worms, Arthropods, Molluscs) varies greatly 
with size, structure, body-temperature, protective covering, &c., increases 
with progressive development. Degree and duration must be separately 
estimated. Graded results — degeneration, cessation of certain functions, 
coma, death. 
Romanes, G. J. Experiments with Pressure on Excitable Tissues. 
P. R. Soc. pp. 446 & 447. 
Roux, W. [See Reprod.]. 
Influence of electrical and mechanical stimulus on Frog ova. Formal 
development of embryo, independent of gravity. 
Sarasin, G. Notiz fiber directe Communication des Blutes mit dem 
umgebenden Medium. Arb. Inst. Wfirzb., viii, Heft. 1. 
Stengel, J. W. Schwerkraft und Zelltheilung. Biol. Centralbl. v, 
pp. 663-668. 
Review of recent researches. 
Stemann, v. Ueber den Einfluss der Nahrung auf das Umherstreifen, 
&c., der Thiere. Jehr. Nat. Ver. f. Schleswig, vi, pp. 108-111. 
