PREFACE TO SECOND EDITION. 



IN preparing a second edition of this little work, I 

 have added, besides notices of many new objects now to 

 be obtained, two chapters, one of which touches upon a 

 new class of objects, which, I doubt not, will become 

 very popular; they are especially adapted for the 

 Binocular Microscope, and the new three-inch Object- 

 glass; I mean those very small moths called Micro- 

 Lepidoptera, which develop from leaf-mining, leaf- 

 rolling, and tent-making caterpillars. 



The second new chapter is on " Injected Anatomical 

 Preparations," noticing those only which are advisable 

 for young students of Natural History, leading them to 

 the interesting study of Comparative Anatomy, and 

 giving, as concisely as possible, the needful information 

 concerning the structure and office of the organs 

 injected. 



It was objected to my first edition, by a scientific 

 critic in the ' Microscopic Journal/ that I had ' ' a 

 tendency to write, which is a damaging propensity 

 where conciseness is of value." I must answer this 

 objection. 



