PREFACE vii 
each lesson include more than are intended to be used, and 
those only will be selected which are in the best condition 
and most convenient. Some attempt has been made also to 
suggest materials adapted to schools that are somewhat 
dependent upon greenhouse specimens. 
It is the opinion of the author that in a high-school 
course in botany little or no time should be given to prepa- 
ration of permanent mounts for the microscope. In making 
good temporary preparations the student will develop an 
appreciation for permanent mounts or lantern slides that 
may be purchased for the laboratory. Those purchased will 
usually be better than the student can make, and when per- 
manent mounts are desired it will be better to buy them. 
At times, however, unusually good materials or field illus- 
trations may be found, and it may be advisable for the stu- 
dents to preserve these in permanent mounts or in pictures. 
At the close of the book is (1) a list of addresses of 
firms furnishing equipment and supplies; (2) a list of pre- 
pared mounts for the microscope, some of which will be 
serviceable in both parts of the manual; and (3) a list of 
books that will be found helpful as texts or reference works. 
In addition to the book used as text, it is desirable to have 
at the student’s disposal a number of approved works for 
collateral reading. 
In presenting this manual it is a pleasure to acknowl- 
edge the author’s obligation to Professor John M. Coulter, 
who by his suggestions and criticism has made possible the 
publication of the book. 
Otis W. CALDWELL. 
Eastern Iniinors State Norma ScHoo1, 
CuHaRLeston, ILL. 
