The Macmillan Company, New York, for permission to reproduce 

 Fig. 86, Portion of the Mycelium of Dry Eot, from Timber and 

 Some of its Diseases, by H. M. Ward. 



Mrs. Katharine Golden Bitting, of Lafayette, Indiana, for the 

 photograph of the cross-section of a bud, Figure 5. 



Finally and not least I hereby acknowledge my obligations to the 

 various writers and publishers whose books and articles I have freely 

 used. As far as possible, appropriate credit is given in the paged 

 references at the end of each chapter. 



