)4.] Presents. 383 



4. That Poisson's ratio, as found by direct measurement, is not the 

 ame as that found by comparing torsion and tension experiments. 



The work entailed in the digestion of these experiments, and their 

 eduction to a small table, has been heavier than the author had 

 nticipated, but as the results show that they are fairly reliable, they 

 nay be of use to those engaged in researches on elasticity. In con- 

 :lusion,. the author begs to thank Professor Kennedy, not only for 

 blowing him the use of his testing machine, but also for directing 

 ;ach experiment, and personally taking its reading. 



[April 30. Somewhat similar experiments were carried out by 

 rWessor J. Bauschinger (see ' Der Civilingeniear,' 1879, 1881, 1882 

 fee.)]. 



Presents, April 19, 1894. 



ictions. 

 iwick : Berwickshire Naturalists' Club. Proceedings. Vol. 



XIV. No. 1. 8vo. [AlnwicJc 1893]. The Club. 



Austin: Texas Academy of Science. Transactions. Vol.1. No. 2. 



8vo. Austin 1893. The Academy. 



Baltimore : Johns Hopkins University. Circulars. Vol. XIII. 



No. 110. 4to. Baltimore 1894. The University. 



Belgrade : Royal Servian Academy. Glas. 41-42. [Servian.] 



8vo. Belgrade 1894 ; Godishnak. 1889-90. [Servian.] 8vo. 



Belgrade 1890-91; Geology of Servia. Atlas. Part 1. 



[Servian.] 4to. Belgrade 1893. The Academy. 



Berlin : Gesellschaft fiir Erdkunde. Verhandlungen. Bd. XXI. 



Nos. 2-3. 8vo. Berlin 1894; Zeitschrift. Bd. XXVIII. 



No. 6. 8vo. Berlin 1893. The Society. 



K. Preiiss. Akademie der Wissenschaften. Sitzungsberichte. 



1893. Nos. 39-53. 8vo. Berlin 1893. The Academy. 



Bremen : Naturwissenschaftlicher Verein. Abhandlungen. Bd. 



XIII. Heft 1. 8vo. Bremen 1894. The Society. 



Bucharest: Societatii de Sciinte Fizice. Buletinul. Anul II. 



Nos. 11-12. 8vo. Bucuresd 1893. The Society. 



Buda-Pesth : Kon. Ungarische Geologische Anstalt. Foldtani 



Kozlony. Kotet XXIII. Fiizet 9-12. 8vo. Budapest 1893 ; 



Mittheilungen. Bd. X. Heft 4-5. 8vo. Budapest 1894. 



The Institute. 

 Cambridge: Cambridge Philosophical Society. Transactions. 



Vol. XV. Part 4. 4to. Cambridge 1894. The Society. 



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



Vol. XXV. Nos. 5-6. 8vo. Cambridge 1894. 



The Museum. 



