LONDON : 28, UPPER GOWER STREET, 

 AND 27, Ivr LANE, PATERNOSTER Row. 

 August, 1855. 



WALTON AND MABEKLY'S New Descriptive Catalogue 

 is now ready, and will be sent (free) by Post to any 

 one writing for it. 



PERPETUAL ALMANAC-PAST, PRESENT, AND FUTURE. 



THE BOOK OF ALMANACS. With an Index of Reference, 



by which the Almanac may be found for every Year, whether in Old 

 Style or New, from any Epoch, Ancient or Modern, up to A.D. 2000. 

 With means of finding "the Day of New or Full Moon, from B.C. 2000 

 to A.D. 2000. Compiled by AUGUSTUS DE MORGAN, Professor of 

 Mathematics in University College, London. 5s. cloth lettered. 



When any almanac information was wanted for a distant year, whether past or 

 future, a person must, as matters have hitherto stood, either have had recourse to a 

 table of Easters and calculation, or to one of the unsatisfactory toys called universal 

 almanacs, in which three or four different references produce Easter Day, and leave 

 the inquirer thence to calculate the matters he wants, or to find them by reference to 

 another table. 



The Book of Almanacs enables any one to lay open before him the whole almanac of 

 any past year, the present year, or of any future year up to A.D. 2000, whether in Old 

 Style or New, by one consultation of a simple index. 



If, for example, the almanac for the year 1806, new style, be wanted, the New Style 

 Index, at 1806, shows that 10 is the number of the almanac, which is therefore found 

 by turning to almanac 16. But the Old Style Index shows that 11 is the number of the 

 almanac for 180(5 in old style. 



The almanac thus obtained contains the Koman Calendar, the Modern Calendar 

 the Sundays, Festivals, and Saints' Days of the English Church, and the Law and 

 University Terms. 



Various tables and methods are given for the verification of the indices, and one in 

 particular, which is a second index-table, contained in one page, by which it may be 

 immediately seen whether any portion of the larger index is correctly printed. 



A table is also given by which, without any calculation (unless adding two small 

 numbers together deserve that name), the time of New or Full Moon may be found for 

 any month of any year, within a day. And tables are given by which, with a calcula- 

 tion which may take a person used to it about a couple of minutes, the New or Full 

 Moon may be found for any month of any year between B.C. 2000 and A.D. 2000. 



This book will be useful to all who want an almanac, past, present, or future ; to 

 Clergymen, as a perpetual index to the Sundays and festivals ; to Lawyers, in 

 arranging evidence which runs over a long period, and to Courts of Law, in hearing 

 it ; to Historical and Antiquarian inquirers, in testing statements as to time and date; 

 to all, in fact, who are ever required to interest themselves about time, past or future. 



It does not, of course, pretend to give the astronomical, political, or statistical 

 information, of which the annual almanac is full ; but it does not yield even to this 

 work in details of a purely chronological character. 



