PREFACE Vll 



volume free use has been made of the Experiment Station 

 Record, from which many passages have been copied, 

 more or less condensed. Most of those relating to foreign 

 and some concerning American work have been thus 

 secured. The majority of these have been set in small 

 type to avoid too frequent references in the text to the 

 source of information. Where possible the original 

 sources were sought and quotations or synopses made 

 first hand. 



The work of Lucien Daniel, so frequently presented 

 in this volume, is likely to effect a revolution among tra- 

 ditional grafting doctrines, but this revolution will prob- 

 ably be slow in its movement because it must not be ac- 

 cepted without repeated investigation. Daniel's theories, 

 though based upon facts, are naturally doubted by many 

 plant propagators or are only partly credited. Yet in 

 practice many of them have already been justified. Herr 

 Lindemuth of the Royal University Garden at Berlin has 

 supported some of them by his investigations and other 

 investigators in Europe, Australia and America have 

 thrown additional light upon the general subject of plant 

 propagation. Considering the importance and the extent 

 of the nursery and florist business, as shown by the last 

 census of the United States, it is evident that competition 

 between establishments will keep plant propagators on 

 the qui vive to test new theories and practices and to 

 adopt all those that will tend toward higher efficiency and 

 economy of production. This fact is attested by the very 

 generous response to requests for aid and suggestion 

 made by nurserymen in many states. This aid the author 

 gratefully acknowledges. 



Special thanks are due Mr. B. F. Williamson of 

 New York who drew almost all of the pen and ink 

 sketches; to Mr. E. T. Kirk, photographer at the Penn- 

 sylvania State College for many of the photos not special- 

 ly referred to below; to Mr. J. R. Bechtel of the horticul- 

 tural department staff at the college for pictures taken in 



