312 Prof. Fitzgerald. On the Equal Partition of [Feb. 14, 



Bickerton (A. W.) Copies of letters sent to 'Nature,' on "Partial 

 Impact." 8vo. Christchurch, N.Z., 1879 ; Some recent evidence 

 in favour of Impact. 8vo. Wellington, N.Z. 1894. 



The Author. 



Buchanan (J. Y.), F.R.S. Sur la densite et 1'alcalinite des eaux de 

 1'Atlantique et de la Mediterranee. 4to. [Paris 1895.] 



H.H. The Prince of Monaco. 



McClintock (E.) Theorems in the Calculus of Enlargement : a method 

 for calculating simultaneously all the roots of an equation. 4to. 

 [Baltimore] 1894. . The Author. 



Roscoe (Sir H. E.) & Classen (A.) Roscoe- Schorlemmer's 

 Lehrbuch der Anorganischen Chemie. Erster Band. Dritte 

 Aunage. Erste Abth. 8vo. Braunschweig 1895. 



Sir Henry Roscoe, F.R.S. 



Vogel (H. C.) Neuere Untersuchungen iiber die Spectra der 

 Planeten. 8vo. Berlin 1895. The Author. 



February 14, 1895. 



Sir JOHN EVANS, K.C.B., D.C.L., LL.D., Vice-President and 

 Treasurer, in the Chair. 



The Right. Hon. Horace, Lord Davey, a Member of Her Majesty's 

 Most Honourable Privy Council, was admitted into the Society. 



A List of the Presents received was laid on the table, and thanks 

 ordered for them. 



The following Papers were read : 



I. " On some Considerations showing that Maxwell's Theorem 

 of the Equal Partition of Energy among the Degrees of 

 Freedom of Atoms is not inconsistent with the various 

 Internal Movements exhibited by the Spectra of Gases." 

 By Professor G. F. FITZGERALD, F.R.S. Received 

 February 7, 1895. 



It has been generally held that a sufficient freedom of internal 

 motion in an atom to explain the spectra of gases proved that the 

 theorem as to equal partition of energy among all degrees of freedom 

 could not hold, and various suggestions have been made as to why 

 the proof, as given by Maxwell, Boltzmaim, and others, fails in this 



