PROCEEDINGS. 
605 
51st Meeting. February 20, 1889. 
The Chairman, Mr. Woodward, presided. 
Present, thirteen members and guests. 
Mr. M. H. Doolittle discussed briefly Two Problems in 
Probabilities. 
Mr. R. S. Woodward stated and briefly discussed A Problem 
in Dynamics. 
523 Meeting. April 3, 1889. 
The Chairman, Mr. Woodward, presided. 
Present, sixteen members and guests. 
Mr. G. W. Hill read a paper on The Combination of Obser¬ 
vations into Normal Positions. 
Mr. C. H. Kummell read a paper on Warped Polyhedra in 
General, with Special Application to the Road-Cutting Solid. 
Mr. A. Hall made a brief communication on the problem: 
Given a chord drawn at random within a given circle, what is the 
probability that its length will be greater than the side of the 
inscribed equilateral triangle ? 
533 Meeting. * May 29, 1889. 
The Chairman, Mr. Woodward, presided. 
Present, twelve members. 
Mr. R. S. Woodward made a communication entitled Notes 
on Problems in Averages. 
