28 Gen. iSub. 
I. GENERAL SUBJECTS. 
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518. Parker, G. H. The reactions of Metridium to food and other 
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519. . Variations in the vertebral column of Necturus. Anat. Anz. 
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520. . Pigment migration in the eyes of Palcemonetes. Zool. Anz. 
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521. Parker, T. Jeffery. Professor Huxley: from the point of view 
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522. Parsons, F. Gr. A plea for details in comparative anatomy. Op. 
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523. Patten, W. Variations in the development of Limalus polyphemus. 
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524. Pearson, K. Mathematical contributions to the theory of evolu- 
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525. . Reproductive selection. Nat. Sci. viii, pp. 321-325. 
526. . Contributions to the mathematical theory of evolution. 
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527. . The utility of specific characters. Nature, liv, pp. 460 & 461, 
528. . Contributions to the mathematical theory of evolution. 
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529. Pearson, K., & Lee, A. Mathematical contributions to the 
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530. & . On a form of spurious correlation which may 
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531. Peck, J. J. Vitality of the spermatozoon. Science, iv, pp. 839 & 
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532. Pelseneer, P. Un Trcmatodo produisant la castration pani- 
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533. Pembrey, M. S., & White, W. Hale. The regulation of tem- 
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534. Perrin, A. Constitution du carpe des Anoures. Bull. Sci. France 
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535. Pettit, A. Recherches sur les capsules surrenales. J. Anat. 
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536. Pieters, M. C. Mim6tisme. Congr. Zool. Leyden, 1895, pp. 460- 
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537. °Pi er allin i, G. Anomalie del processo cariocinetico provocate 
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