Hardwicke’s Elementary Books. 
PRICE TWOPENCE EACH. 
Under the above title is presented to the Public a complete Library 
of Elementary Works adapted for the use of the People. 
Thousands of people at present skilled as handicraftsmen, and as 
workers in the various arts and sciences of life, work from day to day, 
plodding on with some vague notion that they can improve their own par¬ 
ticular calling ; but it generally ends in nothing, because they are ignorant 
of the first principles of those laws which regulate the things in which they 
are engaged. It is a very rare occurrence to meet with workmen who know 
anything beyond what they picked up in their apprenticeship, or obtained 
by imitating others more skilled than themselves. 
It will be the aim of Hardwicke’s Elementary Books to teach 
these first principles. 
No labour or expense will be spared to make the information of a 
thoroughly reliable character; and, where advisable, a free use of authentic 
illustrations will be brought to bear. 
** Hardwicke’s series of ‘ Elementary Books of Science ’ at present includes Optics, 
Hydraulics, Hydrostatics, Geography, Chemistry, Mechanics, and the parts vary in 
price from twopence to sixpence. Against the materials, the writing, or the illus^ 
trations we nave not a word to say; and in them very much to praise.... Each 
part is a very admirable epitome of the subject it treats, and there is more reliable 
information in any one of these little pamphlets of a few pence than there is in many 
a costly volume. The woodcuts are in outline, or only slightly shaded, and their 
subjects are exceedingly well selected .”—London Review. 
NOW READY:— 
Mechanics. 
Fully illustrated by nearly 100 cuts. Two parts, 2d. each ; complete, 4d.; bound 
in cloth, 6d. 
Hydrostatics. 
Fully illustrated. Complete, 2d.; in cloth, 4d. 
Chemistry. 
Three Parts, 2d. each; complete, 6d.; cloth, 8d. 
Hydraulics. 
Fully Illustrated. Complete, 2d.; cloth, 4d. 
Optics. 
Fully Illustrated. Complete, 4d.; doth, 6d. 
Pneumatics. 
Fully Illustrated, 2d. 
Other Works of a similar character are in preparation , and mil 
shortly he announced . 
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