in the theory of value and price.'' 

 9. 



39 



10. 



tank* and free to move only vertically (being so constrained by a 

 telescope arrangement beneath and not shown in the diagram). 

 A glance at fig. 8 or fig. 



10 (a plan of fig. 8) will 

 show that any right and 

 left row of cisterns is rela- 

 tive to a single individual 

 and corresponds to fig. 6 

 and that any front and back^ 

 row is relative to a single 

 commodity and corresponds 

 to fig. 4. 



The water in these cis- 

 terns must be subjected to 

 two sets of conditions, first: 

 the sum of all the contents 

 of lA, IIA, IIIA, etc., shall 

 be a given amount (viz : 

 the whole of the commod- 

 ity A consumed during the 

 given period) with a like given sum for the B row, C row, etc., 

 secondly: the sura of lA, IB, IC, etc., each multiplied by a coetti- 

 cient (the price of A, of B, of C, etc.), shall be given (viz: the 

 whole income of I during the period) with a like given sum for the 



11 row, III row, etc. 



* The level of water in each cistern is intended to be that of the level in the 

 tank. The only constant cause which will make the levels different is the differ- 

 ence between the weight of the whole cistern and the weight of the water dis- 

 placed by its walls (partly wood) which difference is slight, may be plus or 

 minus, and is equal to the weight of the excess or deficit of water in the cistern 

 above or below the outside level. 



