X PREFACE. 



power has therefore been appended to the volume, to enable the 

 reader to see the beautiful microscopical details which have been 

 obtained by this mode of illustration, in which Dr. Maddox is striving 

 to achieve still greater success. 



Many of the best wood engravings in the volume have been 

 engraved by Miss Powell, to whom as well as to Messrs. Harrison 

 for the great care bestowed in printing, the author's thanks are due. 



The author regrets that the book should have been so long out of 

 print, and the publication of the new edition so long delayed. He 

 was anxious to improve it to the utmost of his power and increase its 

 usefulness as a practical work ; and he has, therefore, spared neither 

 time nor trouble, and has refrained from hurrying it through the 

 press, feeling satisfied that time spent in perfecting practical details 

 connected with demonstration, is well employed. For, however some 

 may be inclined to disparage hand work, as distinguished from head 

 work, it is certain that no one can become a good microscopical 

 observer, unless he is possessed of considerable manual dexterity, to 

 be acquired only by long practice ; and no work can be higher or 

 more useful than that of assisting to make men original workers in 

 any department of science, and of encouraging original work. Work- 

 ing books by working men will do far more towards these ends than 

 the most brilliant discoveries, and the author believes that earnest 

 men cannot labour more usefully than by endeavouring to make 

 others work. 



6 1, GROSVENOR STREET, W. 

 August, 1864. 



