LECTURES NATURAL PHILOSOPHY.

THE latest discoveries and improvements have been, as far as possible, introduced into this enlarged edition.

When the original treatise was written, since it was intended, chiefly, as a means of preparing the teachers in training for my lectures, much was reserved for oral explanation.

But I have endeavoured, to adapt the present for private study ; and have given in it every detail which is likely to be of any value to those who are desirous of acquiring accurate, though, at the same time, elementary, information.

Since no amount of scientific knowledge worth possessing, can be obtained without much labour and assiduity, an attempt to popularize subjects which do not admit of it, must be attended with the worst consequences, and practically illustrate the wisdom of the poets advice " A little learning is a dangerous thing ; Drink deep, or taste not the Pierian spring.