34 THE UNIVERSITY SCIENCE BULLETIN. 



5. Marvin, C. F.: Discussion of Rainfall Periodicity. Monthly Weather Re- 



view, Feb., 192L 



6. Schuster, Arthur: On the Periodicities of Sun Spots. Phil. Trans. 206a 



(1906), p. 7L 



7. WoLFER, A.: Revision of Wolf's Sun-spot Relative Numbers. Monthly 



Weather Review, April, 1902, pp. 171-176. Tables of Sun-spot Fre- 

 quencies, ibid, Julv, 1915. Tables of Sun-spot Frequency for the Years 

 1902-1919, ibid, Aug., 1920, p. 459. 



8a. Turner, H. H.: On a Simple Method of Detecting Discontinuities in a 

 Series of Recorded Observations, With an Application to Sun Spots. 

 Suggesting that they are caused by a meteor swarm due to successive 

 encounters of the Leonids with Saturn, which has been more than once 

 perturbed by the Leonid swarm. Monthly Notices Royal Astronomical 

 Society, 19M, pp. 82-109. 



8b. Turner, H. H.: Sun-spot Periodicity as a Fourier Series. Ibid, 1913, 

 pp. 714-732, especially p. 717. 



8c. Turner, H. H.: Further Remarks on the Expression of Sun-spot Perio- 

 dicity as a Fourier Sequence. Ibid, 1914, pp. 16-26. 



9. Sources of Material: 



(a) Climatological Data of the United States. 



(b) Fundamental Data of Siberian Climate. Title and name of author 



in Russian. 



(c) Eliot: The Rainfall of India, 1901. India Monthly Weather 



Review. 



(d) British Rainfall, 1919. Observations Meteorologiques Suedoises, 



published by L'Academie Royale des Sciences de Suede, 1910. 



Hartman: Het klimaat van Nederland, 1913. 



Rainfall tables of Denmark, sent by Professor Carl Ryder in manu- 

 script form. 



(e) Recopilacion de sumas de aqua caida en Chile, 1849-1915, and an- 



nual volumes following. 



(f) Meteorological Observations of the Adelaide Observatory, 1907. 



(g) Pickering: The Relation of Prolonged Tropical Droughts to Sun 



Spots. Monthly Weather Review, Oct., 1920. 

 (h) Manuscripts sent by the Governor General of Madagascar. 



