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PREFACE.

have made some references to works which will help inquirerson their way, hut the nineteen treatises which were cited in theoriginal list were many of them only of gardening interest.I have excluded hooks and papers of simply horticultural,therapeutic, chemical, commercial, or manufacturing interests,unless they contained a sufficient account of the raw pro-duct, its cultivation, or whence obtained, to justify theircitation.

Mr. Symons supplied me with about sixty cuttings fromcatalogues not incorporated with his lists. I checked thesewhere possible, against the volumes themselves either at theBritish Museum , Linnean Society , Kew Museum, or else-where; if I could not find any trustworthy record, I rejectedthem unhesitatingly. I was compelled to examine everytitle without exception, for too great trust had apparentlybeen placed on the catalogues whence they were obtained forme to reprint them. Many of the original entries were tooimperfect to be retained; those which I could not supplementor correct were mostly struck out; a few, however, are still leftin, but marked with an asterisk, to signify that I am in nowise responsible for their accuracy. I cannot here refrainfrom expressing my great regret that Mr. Simmonds shouldhave contented himself with giving so many maimed entriesfrom 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 haveadded all I could conveniently within the time; but a com-plete bibliography of Economic Botany would need the labourof years. I have gone through the Library attached to the