REPORT OF THE SECRETARY. 107 



No. 12. Cambrian geology and paleontology. 11. Cambrian formations of the 

 Robson Peak district, British Columbia and Alberta, Canada. By 

 Charles D. Walcott. 327-343 p., 55-59 pis. (Publ. 2186.) 



No. 13. Cambrian geology and paleontology. II. Dikelocephalus and other gen- 

 era of the Dikelocephalinse. By Charles D. Walcott. 345-408 p., GO- 

 TO pis. (Publ. 2187.) 



Volume 59. 



No. 19. Early Norse Visits to North America. By William H. Babcock. iii, 

 213 p., 10 pis. (Publ. 2138.) 



Volume 60. 



No. 23. The influence of the atmosphere on our health and comfort in confined 

 and crowded places. By Leonard Hill, Martin Flack, James Mc- 

 intosh, R. A. Rowlands, and H. B. Walker. Hodgkius Fund. 96 p. 

 (Publ. 2170.) 



No. 30. Explorations and field-work of the Smithsonian Institution in 1912. 

 76 p., 82 figs. (End of volume.) (Publ. 2178.) 



Volume 61. 



No. 1. The White Rhinoceros. By Edmund Heller. 77 p., 31 pis. (Publ. 

 2180.) 



SMITHSONIAN ANNUAL REPORTS. 



Report for 1911. 



The Annual Report of the Board of Regents for 1911 was received 

 from the Public Printer in completed form in January, 1913. 



Annual Report of the Board of Regents of the Smithsonian Institution, show- 

 ing operations, expenditures, and conditions of the Institution for the year 

 ending June 30, 1911. xii, 688 p., 97 pis. (Publ. 2095.) 



Small editions of the following papers, forming the general ap- 

 pendix of the annual report for 1911, were issued in pamphlet form: 



The gyrostatic compass. By H. Marchand. 5 p., 3 pi. (Publ. 2096.) 



Radiotelegraphy. By G. Marconi. 15 p., 1 pi. (Publ. 2097.) 



Multiplex telephony and telegraphy by means of electric waves guided by wires. 



By George O. Squier. 21 p., 1 pi. (Publ. 2098.) 

 Recent experiments with invisible light. By R. W. Wood. 12 p., 6 pis. (Publ. 



2099.) 

 What electrochemistry is accomplishing. By Joseph W. Richards. 16 p. (Publ. 



2100.) 

 Ancient and modern views regarding the chemical elements. By William 



Ramsay. 15 p. (Publ. 2101.) 

 The fundamental properties of the elements. By Theodore William Richards. 



17 p. (Publ. 2102.) 



The production and identification of artificial precious stones. By Noel Heaton. 



18 p., 3 pis. (Publ. 2103.) 



The sterilization of drinking water by ultra-violet radiations. By Jules Cour- 



mont. 11 p. (Publ. 2104.) 

 The legal time in various countries. By M. Philippot. 8 p. Map. (Publ. 



2105.) 



