34 Gen. Sub. 
I. GENERAL SUBJECTS. 
512. Parsons, P. G. The value of myology as au aid in the classifica- 
tion of animals. Nat. Sci. vii, pp. 336-341 ; Rep. Brit. Ass. 1895, 
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513. Paton, D. NoEl. Muscular energy : the present state of our 
knowledge in regard to its source. Ediu. Med. Journ., June, 1895, 
pp. 1081-1091. 
513a. Paulden, F. The organs and function of reproduction in the 
Jnsecta. Tr. Manchester Micr. Soc. 1895, pp. 43-56. 
Some general discussion of parthenogenesis, &c. 
514. Pearson, K. Mathematical contributions to the theory of 
evolution, n. Skew variation in homogeneous material. P. R. Soc. 
London, lvii, pp. 257-260. Cf. Galton, F., A New Step iu Statistical 
Science, Nature (Letter), li,p. 319 ; also cf. article Brit. Med. Journ. 
(The Mathematical Theory of Evolution and Vital Statistics), 1895, 
i, pp. 545 & 546. 
515. . Contributions to the mathematical theory of evolution. 
in. Regression, heredity, and panmixia. P. R. Soc. London, lix, 
pp. 69-71. 
516. . Note on regression and inheritance in the case of two 
parents. Op. cit. lviii, pp. 240-242. 
517. Pelseneer, P. L’hermaphroditisme chez les Mollusques. Arch. 
Biol, xiv, pp. 33-62, 3 pis. 
518. Pembrey, M. S. The effect of variations in external temperature 
upon the output of carbonic acid and the temperature of young 
animals. J. Physiol, xviii, pp. 363-379. 
519. Pembrey, M S., & White, W. Hale. Heat regulation in hyber- 
nating animals. P. Physiol. Soc. 1895, No. v; J. Physiol, xviii, 
pp. xxxv-xxxvii. 
520. Perez, J. Sur la production des femelles et des males chez les 
Meliponites. C.R. Ac. Sci. cxx, pp. 273-275. \Cf. Ann. Nat. Hist, 
xvi, pp. 125-127.] 
521. ^Perkier, E. Elements de zoologie. Paris : 16mo, 392 pp., 
328 figg. 
. [See also Durand (166).] 
522. Perroncito, E., & Bosso, G. Azione di gas differenti e del 
vuoto sulle uova degli insetti. Giorn. Med. Yet. Prat, xliv, 
pp. 297-301. 
523. Pfeffer, G. Die Entwickelung. Eine naturwissenschaftliche 
Betrachtung. Berlin : 1895, 8vo, 42 pp. 
524. Pflucke, M. Zur Kenntnis des feineren Baues dor Norvonzellen 
bei Wirbellosen. Zeitschr. wiss. Zool. lx, pp. 500-542, 1 pi. 
525. PiiiLiPFON, G. Effets produits sur les animaux par la compression 
et la decompression. J. Anat. Physiol, xxxi, pp. 361-379. 
