PREFACE , Vv 
The proportion of space devoted to the lower plants is less 
than in many texts, and can easily be still further reduced by 
omitting some of the forms, which are treated separately except 
in the paragraphs on relationship. The writer has always omitted 
a number of forms when giving the course in a half year. 
The illustrations were made for this book, under the direction 
of the writer, with the aim of having them well drawn and ac- 
curate. Good drawings not: only are best for purposes of instruc- 
tion but are an inspiration to the student and an incentive for 
him to make good ones himself. The student can hardly be 
expected to make good drawings if those in his text are poor. 
tHE AUTHORS 
