438 A CENTURY OF SCIENCE 



research from that of the botanist or the chemist or even 

 of the physicist, for all the natural sciences obviously deal 

 with closely associated phenomena. The aim of the 

 future will be both to complete fields of study already 

 marked out and to derive a comprehensive explanation 

 of the general principles involved. 



Notes. 



1 Proc. Biol. Soc. Washington, 3, 35, 1886. 



2 Ibid, 4, 9, 1888. Both of these papers are reprinted in Ann. Eept. 

 Smithsonian Inst., 1897, U. S. Nat. Mus., Pt. 2, pp. 357-466, 1901. 



Louis Agassiz: his Life and Correspondence, by Elizabeth Carey 

 Agassiz, p. 145, 1885. 



List of North American Land Mammals in the United States National 

 Museum, 1911. Bull. 79, U. S. Nat. Mus., 1912. 



6 Birds of North and Middle America, Bull. 50, parts I- VII, U. S. Nat. 

 Mus., 1901-1916. 



6 Report U. S. Nat. Mus. for 1898, pp. 153-1270, 1900. 



7 Bull. 34, U. S. Nat. Mus., 1889. 



6 Bull. 47, parts I -IV, U. S. Nat. Mus., 1896-1900. 



8 J. Loeb, The Organism as a Whole, p. 126, 1916. 

 10 The Germ-cell Cycle in Animals, 1914. 



u The Cell in Development and Inheritance, 1896 ; second edition, 1900. 

 "Morgan, T. H. A critique of the theory of evolution, p. 32, 1916. 



