VIU PREFACE. 



have made some references to works which will help inquirers 

 on their way, but the nineteen treatises which were cited in the 

 original list were many of them only of gardening interest. 

 I have excluded books and papers of simply horticultural, 

 therapeutic, chemical, commercial, or manufacturing interests, 

 unless they contained a sufl&cient account of the raw pro- 

 duct, its cultivation, or whence obtained, to justify their 

 citation. 



Mr. Symons supplied me with about sixty cuttings from 

 catalogues not incorporated with his lists. I checked these 

 where possible, against the volumes themselves either at the 

 British Museum, Linnean Society, Kew Museum, or else- 

 where ; if I could not find any trustworthy record, I rejected 

 them unhesitatingly. I was compelled to examine every 

 title without exception, for too great trust had apparently 

 been placed on the catalogues whence they were obtained for 

 me to reprint them. Many of the original entries were too 

 imperfect to be retained ; those which I could not supplement 

 or correct were mostly struck out ; a few, however, are still left 

 in, but marked with an asterisk, to signify that I am in no 

 wise responsible for their accuracy. I cannot here refrain 

 from expressing my great regret that Mr. Simmonds should 

 have contented himself with giving so many maimed entries 

 from pamphlets in his own possession under the heading 

 * Anonymous ' publications ; a trifling amount of addi- 

 tional trouble would have made them quotable or recog- 

 nizable. 



In addition to examining the titles furnished me, I have 

 added all I could conveniently within the time; but a com- 

 plete bibliography of Economic Botany would need the labour 

 of years. I have gone through the Library attached to the 



