1895.] Presents. 217 



when the force varies as the inverse *: th power, and K > 3, the formulae 

 for the inverse cube being much simpler than for any greater power. 



Lastly, the potential of a special elliptic disc is discussed which has 

 the property that the level surfaces are confocals, the force varying 

 as any odd inverse power greater than the square. 



In this list only those properties have been mentioned which the 

 author believes to be new. 



Presents, June 13, 1895. 

 Transactions. 



Berkeley: University of California. University of California 

 Studies. Vol. I. No. 2. 8vo. Berkeley 1894; Bulletin of 

 the Department of Geology. Vol. I. Nos. 5 9. 8vo. 

 Berkeley 1894-95 ; Report of Work of the Agricultural Experi- 

 ment Stations. 1892-94. 8vo. Sacramento 1894; A Brief 

 Account of the Lick Observatory, by E. S. Holden. 8vo. 

 Sacramento 1895 ; [and 7 other University Publications] . 8vo. 



The University. 



Berlin : Gesellschaft fur Erdkunde. Zeitschrift. Bd. XXX. 



No. 2. 8vo. Berlin 1895. The Society. 



K. Preuss. Akademie der Wissenschaften. Sitzungsberichte. 



1895. Nos. 125. 8vo. Berlin. The Academy. 



Bremen: Naturwissenschaftlicher Verein. Abhandlungen. Bd. 



XIII. Heft 2. Bd. XV. Heft 1. 8vo. Bremen 1895. 



The Society. 



Cambridge, Mass. : Museum of Comparative Zoology. Bulletin. 

 Vol. XXV. No. 12. 8vo. Cambridge, Mass. 1895. 



The Museum. 



Cracow: Academie des Sciences. Bulletin International . Avril, 



1895. 8vo. Cracovie. The Academy. 



Edinburgh : Bx>yal Society of Edinburgh. Proceedings. Vol. XX. 



Pp. 305384. 8vo. Edinburgh [1894-95]. The Society. 



Leipsic: Konigl. Sachsische Gesellschaft der Wissenschaften. 



Abhandlungen (Math.-phys. Classe). Bd. XXII. No. 1. 8vo. 



Leipzig 1895 ; Berichte iiber die Verhandlungen (Math.-phys- 



Classe). 1895. No. 1. 8vo. Leipzig. The Society. 



London: Anthropological Institute. Journal. Vol. XXIV. 



No. 4. 8vo. London 1895. The Society. 



British Astronomical Association. Journal. Vol. V. No. 7. 



8vo. London 1895 ; Memoirs. Vol. II. Part 6. 8vo. London 



1895. The Association. 



Entomological Society. Proceedings. ]895. Part 2. 8vo. 



London. The Society. 



