342 CALIFORNIA ACADEMY OP SCIENCES. 



Romanes, Geo. J. Physiologicai Selection and the Origin of Species. Na- 

 ture, xxxiv, pp. 439, 545. 



Physiological Selection; Nineteenth Century, xxi, pp. 59-80. 



The Factors of Organic Evolution. Nature, xxxvi, pp. 401-407. 



Mr. Seebohm on Physiological Selection, Nature, xxxviii, p. 246. 



Lamarckianism versus Darwinism, Nature, xxxviii, pp. 413-490. 



Definition of the Theory of Natural Selection, Nature, xxxviii, 



pp. 616-618. 



Mr. Dyer on Physiological Selection. Nature, xxxix, pp. 103-104. 



Natural Selection and the Origin of Species. Nature, xxxix, pp. 



173-175. 



Darwinism. Nature, xxxix, p. 645. 



Weismann's Theory of Heredity. Contemporary Eeview, May, 



1890, pp. 686-699. 



Ryder, J. A. A Physiological Hypothesis of Heredity and Variation. 

 American Naturalist, xxiv, p. 85. 



An Attempt to Illustrate some of the Primary Laws of Mechanical 



Evolution. Proc. Phil. Acad. Nat. Sci., 1891, pp. 62-70. 



Sauermann. Archiv. Anatomie und Physiol., 1889, Physiol., Abtheil., 

 543. 



ScHURMANN, J. G. The Ethical Import of Darwinism. 



Seebohm, Henry. The Geographical Distribution of the Family Chara- 

 driida9, or the Plovers, Sandpipers, Snipes and their Allies. Lon- 

 don, 1888. 



Semper, Karl. Animal Life as affected by the Natural* Conditions of 

 Existence. 



Spencer, Herbert. The Factors of Organic Evolution. 



Principles of Biology. 



Stejneger, Leonhard. Riverside Natural History. Vol.iv. The Birds. 



Results of Ornithological Explorations in the Commander Islands 



and in Kamtschatka. Bull. U. S. Nat. Mus., 29. 



Sutton, J. B. On Atavism. Proc. Zool. Soc, 1886, pp. 551-558. 



Thomson, J. A. Synthetic Summary of the Influence of the Environ- 

 ment upon the Organism. Proc. Roy. Physical Soc. of Edinburg, 

 vol. ix, p. 446. 



Todd, J. E. Directive Coloration. Am. Nat., xxii, pp. 201-207. 



Trotter, S. Effect of Environment in the modification of the bill and 

 tail of birds. Proc. Phil. Acad. Nat. Sci., 1891, pp. 118-119. 



Trow, A. H. A Difficulty in Weismanu. Nature, xxiv, pp. 102, 175. 



Vines, S. H. An Examination of Some Points in Prof. Weismann's The- 

 ory of Heredity. Nature, Oct. 24, 1889, pp. 621-626. 



ViRCHow, R. Descendenz und Pathologie. Virchow's Archiv., ciii, pp. 

 1-15, 205-215, 413-437. 



Ueber den Transformismus. Tag. Deutcsh. Nat. Vers. No. 6, pp. 



136-144; Biol. Centralbl. vii, pp. 545-561. 



