PREFACE Xlii 



In the preparation of this book the authors have received 

 a great many suggestions from the teachers in their own 

 departments and those of other schools. Our thanks are due 

 to Miss M. Helen Smith of the Manual Training High School, 

 Brooklyn, N. Y. for several laboratory outlines which formed 

 the basis of corresponding studies in the following pages. 

 The authors have been especially fortunate in securing the 

 constructive criticism of Dr. C. Stuart Gager, Director of 

 the Brooklyn Botanic Garden of the Brooklyn Institute of 

 Arts and Sciences. He has carefully read all of the manu- 

 script and the page proofs. 



We are indebted to Dr. H. J. Webber, Professor E. O. 

 Fippin, and others at Cornell University, for valuable ma-* 

 terial and illustrations for the chapter on Plant Propagation. 

 We wish, also, to express our hearty appreciation of the 

 generous permission of Henry Holt & Co. to use some of the 

 material published in Peabody's " Laboratory Exercises in 

 Anatomy and Physiology." We are fortunate, too, in secur- 

 ing from the New York Botanical Garden photographs for 

 the frontispiece, and for several fine cuts in the text, and from 

 Professor E. M. East of Harvard University the cut for Fig. 

 52. Miss Mabelle Baker, Miss Clara Lang, Miss Margaret 

 Cutler, and Miss Grace Gamble, students in our first-year 

 classes, have kindly prepared for us the figures on which 

 their several names appear. 



Cost prices for the items on the list of laboratory appara- 

 tus and equipment were kindly furnished us by Bausch & 

 Lumb, Kny-Scheerer, and O. T. Louis; from these prices the 

 estimates on pp. 173 to 177 were prepared. 



J. E. P. 

 A. E. H. 



January 31, 1912. 



