vi AUTHOR'S PREFACE. 



The outlines here included, subject to variations neces- 

 sitated by peculiarities of local environment, have been 

 used by the writer in courses given in the University of 

 Chicago, the Biological Station of the University of 

 Indiana, and the Eastern Illinois State Normal School. 

 In addition to this test of use the manuscript has been 

 read and improved in very important ways by the authors 

 of Plant Dissection, and by Professor F. E. Lloyd of 

 Teachers College, New York, and Professor F. L. 

 Stevens of the State Agricultural College, Raleigh, N. C., 

 to all of whom grateful acknowledgments are made. 



OTIS W. CALDWELL. 



THE EASTERN ILLINOIS STATE NORMAL SCHOOL, 

 October 5, 1904. 



