TITLES. 
Gen . Sub. 29 
548*. Paget, St. John Hunter, man of science and surgeon (1728-1793). 
8 vo, London, 272 pp. 
549. Papillault, G. Le transformisme et son interpretation en cranio- 
logie. Bull. Soc. Anthrop. viii, pp. 377-401, Rev. Scient. viii, pp. 
385-393. 
550. Parker, G. H. Photomechanical changes in the retinal pigment 
cells of Palcemonetes, and their relation to the central nervous system. 
Bull. Mus. Harvard, xxx, pp. 277-300, 1 pi. 
551. Parker, T. Jeffery [the late]. Lessons in elementary biology 
(third enlarged edition). London and New York, 8vo, xxiii & 503 pp., 
127 figg. 
552. & Haswell, W. A. A Text-Book of Zoology, vol. i, xxxv & 
779 pp., figg. 1-663 ; vol. ii, xx & 683 pp., figg. 664-1173, 8vo, London. 
Parker, W. N. [See Wiedersheim & Parker (768).] 
553. Pearson, K. The chances of death, and other studies in evolution. 
2 vols. 8vo, London, xii & 388 ; iv & 460 pp. 
554. . On the scientific measure of variability. Nat. Sci. xi, pp. 
115-118. 
555. . Mathematical contributions to the theory of evolution. — On a 
form of spurious correlation which may arise when indices are used in 
the measurement of organs. P. R. Soc. London, lx, pp. 489-498. 
556. & Filon, L. N. G. Mathematical contributions to the theory of 
evolution, iv. On the probable errors of frequency constants and on 
the influence of random selection on variation and correlation. P. R. 
Soc. London, lxii, pp. 173-176. 
. [See also Lee & Pearson (435).] 
557. Peebles, Fl. Experimental studies on Hydra. Arch. Entwickmech. 
v, pp. 794-819, 34 figg. 
558. Pekar, C. Explication des figures dites anormaux dans la pluripar- 
tition indirecte du noyau, d’apr6s les recherchcs de M. le Dr. E. 
Krompecher. J. Anat. Physiol, xxxiii, pp. 654-660. 
Pelseneer, P. [See Blanchard, R. (57).] 
559. P£rez, J. Des effets des actions mecaniques sur le developpement des 
oeufs non fecondes du ver & soie. Pr.-verb. Soc. Bordeaux, 1897, 
pp. 9 & 10. 
560. Perrier, E. Traits do Zoologie. Fasc. 4. Yers (suite), Mollusques. 
8 vo, Paris, pp. 1345-2140, 566 figg. 
561. Pfeffer, G. A. Ortmann und die arctisch-antartisch Fauna. Zool. 
Anz. xx, pp. 323 & 324. 
562. * . Ueber die niedrigste Auspragung der lebendigen Individuali- 
tat und das Lebens-Differential. Yerh. Yer. Hamburg naturw. iv, 
pp. 27-49. 
563. Pfitzner, W. Ein Beitrag zur Kenntniss der sekundaren Geschlechts- 
unterschiede beim Menschen. Morphol. Arbeit, vii, pp. 473-515, 
4 figg. 
564. Phisalix, G. Ycnins ot animaux venimeux dans la sdrie animalo. 
Rev. Scient. viii, pp. 97-104, 195-201, 329-335. 
565. . Antagonisme entre le venin des Vespidse et celui de la vip&re; 
le premier vaccine contre le second. C.R. Ac. Sci. exxv, pp. 977-979, 
Bull. Mus. Paris, 1897, pp. 318-320, C.R. Soc. Biol, iv, pp. 1031-1033. 
