1883-1 
Analyses of Books . 
683 
Accented Five-figure Logarithms of Numbers from 1 to 99999, 
without Differences . Arranged and accented by Lewis d’A. 
Jackson. London : W. H. Allen and Co. 
The author, in his Introduction, advocates the use for ordinary 
purposes of four- or five-figure logarithms in place of the seven- 
figured. He remarks that the computers in the Nautical 
Almanack office can calculate the whole of their occupations, 
almost all their eclipses, and all the places of the stars except 
the circumpolar ones, with four-figure trigonometrical logarithms, 
giving minutes of arc. Wherever the entire seven figures can- 
not be utilised, their employment is a waste of time and labour. 
By his system of accentuation he offers a remedy for the defects 
of five-figure logarithms, as he has done in a previous work for 
those of four figures. The author denotes, e.g., log. 88637 
by 94762, log. 88638 by 94762, and log. 88639 by 94762, ; the 
two signs, the dash above and the dot below, have the same 
mean value, one being 0*3 less and the other 0*3 more than the 
first plain number. Instructions, with examples, are then given 
for computing with accented logarithms. 
In addition to the table referred to in the title-page, there is a 
table of accented five-figure logarithms for sines, tangents, co- 
tangents, and cosines of angles from o° to 90°, to every hundredth 
of a degree. 
The work finishes with a comparative table of French and 
English decimal scientific systems. Many of our readers will 
not require to be told that Mr. Jackson has re-cast the decimal 
system of weights and measures in a manner which, while re- 
taining its advantages, does away with the objections urged 
against it by practical men. In particular, he has introduced or 
retained plain short names for the different denominations in 
place of the awkward and lengthy terminology which the French 
unhappily introduced. 
Longman's Magazine. No. XII. October, 1883. London : 
Longmans and Co. 
We find here a very remarkable paper, by Dr. B. W. Richardson, 
entitled “ Cycling as an Intellectual Pursuit.” In this light we 
suspect it will have been very rarely regarded, the more as a 
large part of its votaries do not seem overburdened with intelli- 
gence. The writer begins with a confession which we hope is 
not true of the majority of men, even when well advanced in 
years. He says : — “ If I walk ten miles in three hours — a fair 
pace — I am tired : my ankles feel weak, my feet sore, my 
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