INTRODUCTION 3 



A section entitled '' Material, Apparatus, and Supplies " gives 

 lists of preparations for the microscope, favorable material for 

 histological work, apparatus and supplies, with the addresses of 

 dealers who furnish these to the trade. 



The bibliography has been chosen with the purpose of present- 

 ing a group of books many of which are within the possibilities 

 even of a well-equipped school library, rather than a lengthy list 

 of detailed literature which is usually only handled by the spe- 

 cialist. These works are numbered and the references to them 

 throughout the manual will be by the author's name and the 

 number. 



An appendix with suggestions to instructors follows the bibliog- 

 raphy. This contains matter which it is not necessary for the 

 student to read in connection with his laboratory work, although 

 in many cases it may be of interest for him to do so. The ap- 

 pendix is really a collection of practical notes based on the 

 experience of the authors or gathered from conversations and 

 correspondence with many teachers. Indeed, it is a feature which 

 the authors have introduced in the hope that it may bring forth 

 other helpful and practical suggestions from those who use the 

 book, and correspondence upon this subject is cordially invited. 



A glossary gives a selected list of botanical terms, including 

 the most important of those used in this manual and in the 

 authors' Principles of Botany. 



Only a few necessary abbreviations have been used, to econo- 

 mize space. As stated above, books listed in the bibliography 

 are referred to by the author's name and number in the list. 

 Pi'inciples designates the Principles of Botany ; App., the ap- 

 pendix ; l.p., m.p., and h.p. refer to low power, medium power, 

 and high power of the compound microscope respectively ; lens 

 means either hand lens or dissecting microscope as the case may 

 be ; c.p. means chemically pure. The usual abbreviations for 

 the units of the metric system are frequently employed. 



