36 MACMILLAWS CATALOGUE OF 



JCVOnS (W.S.) continued. 



by day," the author says, "if becomes more evident that the 

 coal we happily possess in excellent quality and abundance is the 

 mainspring of modern material civilization" Geologists and 

 other competent authorities have of late been hinting that the 

 supply of coal is by no means inexhaustible, and as it is of vast 

 importance to the country and the world generally to know the real 

 state of the case, Professor Jevons in this work has endeavoured to 

 solve the question as far as the data at command admit. He 

 believes that should the consumption multiply for rather more than 

 a century at its present rate, the average depth of our caul mines 

 would be so reduced that we could not long continue our present rate 

 of progress. "We have to make the momentous choice," he believer, 

 "between brief greatness and long-continued prosperity." " The 

 question of our supply of coal," says the PALL MALL GAZETTE, " be- 

 comes a question obviously of life or death. . . , The whole case is 

 stated with admirable clearness and cogency. . . . We may regard 

 his statements as unanswered and practically established." 



THE THEORY OF POLITICAL ECONOMY. 8vo. gs. 



In this work Professor Jevons endeavours to construct a theory of 

 Political Economy on a mathematical or quantitative basis, believing 

 that many of the commonly received theories in this science are per- 

 niciously erroneous. The author here attempts to treat Economy 

 as the Calculus of Pleasure and Pain, and has sketched out, almost 

 irrespective of previous opinions, the form which the science, as it 

 seems to him, must ultimately take. The theory consists in apply- 

 ing the differential calculus to the familiar notions of Wealth, 

 Utility, Value, Demand, Supply, Capital, Interest, Labour, and 

 all the other notions belonging to the daily operations of industry. 

 As the complete theory of almost every other science involves the use 

 of that calculus, so, the author thinks, we cannot have a true theory 

 of Political Economy without its aid. " 'Professor Jevons has done 

 invaluable service by courageously claiming political economy to be 

 strictlv a branch of Applied Mathematics." WESTMINSTER 

 REVIEW. 



Martin. THE STATESMAN'S YEAR-BOOK: A Statistical 

 and Historical Annual of the States of the Civilized World. 

 Handbook for Politicians and Merchants for the year 1872. By 



