147 



additional facts of interest are given with reference to diseases 

 previously mentioned in the text, and several diseases not before 

 listed are discussed. Of the latter may be mentioned apple 

 mildew due to Podosphaera leucotricha Salmon, black knot of 

 birch caused by Plowrighlia virguUorum Saccardo, tomato fruit 

 rot due to Phoma destructiva Plowright, yellow stripe of hyacinths 

 caused by Bacterium hyacinthi Wakkcr, and mosaic disease of 

 potatoes, tomatoes, and tobacco. No attempt has been made 

 by the author to revise and bring up to date the facts given in 

 the body of the text. Many of these are in consequence incorrect 

 or incomplete. 



The present work although prepared along similar lines to the 

 "textbook of plant diseases," the first edition of which was 

 published by the author in 1899 is consideraljly larger and has 

 a wider scope. It contains, in addition to the remarks upon 

 fungous, bacterial, and slime mould diseases of plants, chapters 

 on injuries due to frost, hail, wind, smoke, gas fumes, mites, 

 nematodes, birds, animals, and man. There are also brief 

 chapters on fungicides, spraying, soil-bacteriolog>% chlorosis, 

 mycorhiza, biologic species, phanerogamic parasites, so-called 

 physiological diseases, and injuries due to non-parasitic organ- 

 isms. The author endeavors to treat not only the diseases of 

 Great Britain and continental Europe but also the important 

 diseases of the tropics, and certain of those occurring in the 

 United States. The discussion of each disease embraces a 

 description of its more characteristic symptoms, certain facts of 

 interest regarding the causal organism, and suggestions on control 

 measures. The number of diseases included is very large, it 

 would seem perhaps unnecessarily so, and uncommon maladies 

 are frequently given more space than better known or more 

 destructive ones. As a compilation of facts bearing upon a 

 large number of plant diseases the book must be given a place 

 among the first t\vo or three manuals available in English. It 

 has however certain limitations and certain faults which render 

 it to a degree unsatisfactory. This is particularly true from the 

 standpoint of the American student of plant pathology*. 



When the first edition of this text appeared in 1910 it was 



