PEEFACE TO THIRD EDITION. 



An entire revision of the text has been made in this new 

 edition. Information regarding the microscope, its acces- 

 sories and methods of manipulation, have been brought 

 into line with present-day knowledge and practice. 



The instructions for preparing and mounting microscopic 

 objects have been extended and are more varied. 



A third part has been added on the sdbject of the choice 

 and use of microtomes, for which we desire to express our 

 special thanks to Mr. G-. West, of the Botanical Laboratory, 

 Edinburgh. The directions given are compressed within 

 narrow limits, and are designed especially to aid the 

 beginner. Acknowledgments are also due to the pub- 

 lishers of Knowledge, of 326, High Holborn, for permission 

 to use several notes and articles which have appeared in 

 their columns, and to numerous friends who have con- 

 tributed their kind advice and suggestions for the improve- 

 ment of the book. 



M. I. C. 



M. J. C. 



London, 



November, 1902. 



