ON THE ERRATIC BLOCKS OF ENGLAND, IRELAND, AND "WALES. 247 



89. Leaning against footbridge ; a porphyritic granite ; 4 ft. by 2 ft. 9 in. by 1 ft 



6 in. ; sub-angular. 



90. Ditto. A porphyritic granite ; 3 f t. C in. by 2 ft. 6 in. by 2 ft. ; rounded. 



91. A porphyritic granite ; 2 ft. by 1 ft. 6 in. by 1 ft.. ; roimded. 



92. Horublendio granite, probably Scotch ; 2 ft., by 1 ft. 6 in. by 1 ft. 6 in. 



rounded. 



93. Porphyritic grey granite ; 2 ft. 6 in. by 1 ft. 6 in. by 1 ft. 6 in. 



94. Porphyritic grey granite ; 2 ft. by 2 ft. by 1 ft. 6 in. 



93. Porphyritic gi-ey granite ; 2 ft. by 1 ft. (J in. by 1 ft. 6 in. ; together with some 

 small Eskdale syenites. 



Gnnston. 



96. Small block, broken ; a compactly crystalline hornblendic granite, probably 



Scotch. 



97. Ditto. A porphyritic hornblendic granite, probably Buttermere ; small. 



Worcestershire. 



Mr. Westby reports tlie discovery of an erratic block of granite, of 

 the Criffel type, in the neighbourhood of Worcester. 



It was found at Corumeadow, one-third of a mile S. of St. Claines 

 Church, 2^ miles N. of Worcester, about 20 yards from the road, and 

 three-fourths of a mile E. of the river Severn. It rests upon the bed of 

 gravel stretching from the river to the field. It is partly sunk under 

 ground ; the exposed part measures 3 ft. x 1 ft. 9 in. x 1 ft. 7 in. In shape 

 it is semi-oval ; the N. end and the sides are smooth and well rounded, 

 but the S. projecting end is rougher. 



Report of the CoTnmittee, consisting of Mr. S. Bourne, Mr. F. Y. 

 Edgeworth (Secretary), Professor H. S. Foxwell, Mr. Robert 

 GriFFEN, Professor Alfred Marshall, Mr. J. B. Martin, Professor 

 J. S, Nicholson, Mr. R. H. Inglis Palgrave, a7id Professor H. 

 SiDGWiCK, appointed for the purpose of investigating the best 

 Tnethods of ascertaining and measuring Variations in the Value 

 of the Monetary Standard. {Draiun up by the Secretary.) 



Analysis. 



I. The Ideal Method ; involving philosophical analysis. 



II. The Practical Method ; consisting of (A) one principal standard, based upon 

 the items of national consumption ; and (P>) six auxiliary index numbers, based 

 resppctively on (1) wholesale goods in general, (2) imports and exports, (3) all exist- 

 ing purchasable commodities, (4) budgets of workmen's families, (5) general wages, 

 (6) retail prices. 



It appears to the Committee that there are two ways of treating the pro- 

 blem proposed to them : two solutions, which may be distinguished as 

 Theoretical and Practical. I. The theoretically perfect method is to dis- 

 tingnish analytically the different purposes which may be subserved by 

 constructing a measure of the change in the value of money, and then to 

 show what formula, what particular mode of combining the statistical 

 data, is appropriate to ea3h purpose. For example, one might distinguish 

 as adapted to diflPerent special purposes two measures or standards which 

 have been proposed by Prof. Sidgwick and Prof. Nicholson respectively. 



