PROCEEDINGS. 
601 
46th Meeting. October 31, 1388. 
The Chairman presided. 
Present, fourteen members and guests. 
The minutes of the 44th and 45th meetings were read and, 
after amendment, approved. 
On motion, the Section voted to offer for publication in extenso 
the paper by Mr. A. Hall on Problem-Solving, read at the 44th 
meeting. 
Mr. R. S. Woodward presented a communication on The Sum¬ 
mation of Certain Complex Series. 
The details of the analysis* involved in this summation are 
given in full in a paper on The Diffusion of Heat in Homoge¬ 
neous Rectangular Masses, with Special Reference to Bars used as 
Standards of Length, in No. 4, vol. iv, of the Annals of Mathe¬ 
matics, University of Virginia, Va., 1888. 
Mr. G. W. Hill read a paper on the Application of Infinite 
Determinants to the Integration of Differential Equations. 
47th Meeting. December 12, 1888. 
The Chairman presided. 
Present, fourteen members and guests. 
Minutes of the 46th meeting read and approved. 
Mr. W. C. Winlock presented a communication on Comet 
1888 (/) V (Barnard, Oct. 30). 
The substance of this communication was published in the 
Astronomical Journal, vol. 8, p. 136 and p. 148, Boston, 1889. 
Mr. A. Hall presented a note on a method of deducing the 
right ascension and declination of an object observed to be at the 
intersection of the diagonals of a quadrilateral of the celestial 
sphere, from the right ascensions and declinations of the four 
vertices of the quadrilateral. 
77—Bull. Phil. Soc., Wash., Vol. 11. 
