viii PREFACE 



quill wort for illustration), a pine (with other conifers and 

 Cycas, Zamia and Ginkgo for illustration). 



Many of the illustrations are new and were made especially 

 for this book, the photographs being made by the author and 

 the drawings by Mr. Frank Rathbun under the author's super- 

 vision. Acknowledgments are due to Messrs. Ginn and Company 

 for the use of a few illustrations from Bergen and Davis's Prin- 

 ciples of Botany and from the author's First Studies in Plant 

 Life; to D. Appleton & Co. for the use of a few illustrations 

 from Coulter's Botany; and to the Bureau of Forestry and the 

 Bureau of Plant Industry, U. S. Dept. of Agriculture, for some 

 photographs which are acknowledged in connection with the 

 illustrations. 



G. W. A. 



CORNELL UNIVERSITY, April, 1910. 



