122 BULLETIN OF THE 



sets could be so constructed that one of them woulfl represent a 

 function of three variables represented by the other three. 



The paper was discussed by Mr. Harkness and Mr. H. A. Hazex, 

 Mr. Harkness pointed out that the construction of a two-argument, 

 computation table by means of curved lines was not novel. 



224th Meeting. November 1$, 1882. 



The President in the Chair. 



Forty members present. 



The minutes of the last meeting were read and adopted. 



Mr. E. B. Elliott spoke 



ON SURVIVORSHIPS, WITH TABLES AND FORMULAS OF CONSTRUCTION. 



(No abstract has been furnished.) 

 Mr. H. A. Hazen submitted a paper 



ON THE COMING WINTER OF 1882~'83. 



The following is an abstract : 



It has been a great desideratum, and one which has called out 

 the efforts of many men, to determine in advance the probable char- 

 acter of a season. A prominent meteorologist has inferred that the 

 coming winter is to be a very severe one, because, as he says, "every 

 one knows that a cold and wet summer is invariably followed by a 

 cold and stormy winter." In order to obtain probable sequences 

 in the weather, if we could in any way determine the mean temper- 

 ature or pressure over an extensive region, it would seem as though 

 results would be far more satisfactory than those from a single sta- 

 tion. The following plan has been adopted for ascertaining such 

 mean results: 



We may draw isobars or any isometeorologic lines upon a map 

 of a country ; then we may rule a large number of squares upon 

 glass or some transparent substance ; and after that, by placing 

 these squares upon the map, we may at a glance interpolate the 

 exact pressure or temperature in each square, and a mean of all the 

 squares would give a mean for the whole country. 



