1891.] 



Presents. 



463 



In Diagram II 



(a) shows the observed pressure, 

 (&) theoretical pressure, 

 an india-rubber balloon for which t jr = 0'0125. 

 (c) is the value of K. 



The rather uncertain nature of the measurements of both t and i/,> 

 these experiments makes the close apparent agreement between 

 observed and theoretical results somewhat illusory ; but it shows 

 at any rate that, if among the values obtained for t and v those are 

 taken which make theory and observation coincide for one value of 

 *, the remaining observations will also lie on the theoretical curve. 



Presents, April 23, 1891. 



insactions. 



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

 No. 86. 4to. Baltimore 1891 ; Studies from the Biological 

 Laboratory. Vol. V. No. 1. 8vo. Baltimore 1891 ; Studies 

 in Historical and Political Science. Ninth Series. Nos. 3-4. 

 8vo. Baltimore 1891. The University. 



Belgrade : Royal Servian Academy. Memoirs. Nos. 2, 5-7. 4to. 

 Beograd 1890 ; Bulletin. Nos. 18, 21-23, 27. 8vo. Beograd 

 1890 ; Annual. 1888. 8vo. Beograd 1889. [In the Servian 

 language.] The Academy. 



Birmingham : Free Libraries Committee. Twenty-ninth Annual 

 Report. 1890. 8vo. Birmingham 1891. The Committee. 



Cambridge : Cambridge Philosophical Society. Transactions. 

 Vl. XV. Part 1. 4to. Cambridge 1891; Proceedings. 

 Vol. VII. Part 3. 8vo. Cambridge 1891. The Society. 



Catania : Accademia Gioenia di Scienze Naturali. Atti. Serie 4 a . 

 Vol.11. 4to. CatanialSQO- Bullettino Mensile. Fasc. 16-17. 

 8vo. Catania 1891. The Academy. 



