LIST OP SMITHSONIAN PUBLICATIONS. 19 



Smithsonian Contributions to Knowledge. Yol. XVII. 

 1871. 4to. G16 pages, 14 plates, and 5 wood-cuts. . (229.) 



CONTENTS. 

 Morgan, Systems of Consanguinity and Affinity of the Human Family. (218.) 



Smithsonian Contributions to Knowledge. Vol. XVIII. 



1873. 4to. G43 pages, 8 plates, and 10 wood-cuts. (246.) 



CONTENTS. 



Schott, Tables of Rain and 'Snow. (222.) 



Stockwell, Secular Variations of the Orbits of Planets. (232.) 



Hakkness, Observations on Terrestrial Magnetism. (239.) 



Fekrel, Converging Series, expressing the Ratio between the Diame- 

 ter and the Circumference of a Circle. (233.) 



Smithsonian Contributions to Knowledge. Vol. XIX. 



1874. 4to. 660 pages, 21 plates, and 5 wood-cuts. (272.) 



CONTENTS. 



Barnard, Problems of Rotary Motion. (240.) 



Wood, Fresh-water Algae of North America. (241.) 



Newcomb, Orbit of Uranus. (262.) 



Smithsonian Contributions to Knowledge. Vol. XX. 

 1876. 4to. 794 pages, 26 plates, and 3 wood-cuts. (284.) 



CONTENTS. 

 Coffin, The Winds of the Globe. (268.) 



Smithsonian Contributions to Knowledge. Vol. XXI. 

 1876. 4to. 543 pages, 10 plates, and 29 wood-cuts. (285.) 



CONTENTS. 



Alexander, Harmonies of the Solar System. (280.) 



Newcomb, Integrals of Planetary Motion. (2S1.) 



Swan, Haidah Indians of Queen Charlotte's Islands, British Columbia. (267.) 



Schott, Tables, Atmospberic Temperature in United States. (277.) 



