TREFACE. Xlll 



in the case of the Jussieus, more information was requisite ; I 

 have likewise omitted repeating the size of each edition, when 

 there was no difference between them. The abbreviations 

 used will, I believe, not give any trouble ; the place of pub- 

 lication is frequently, and, as in the case of London, almost 

 always shortened ; no one will go astray in the matter of Lond. 

 for London or Londini, Kjoeb. for Kjoebenhavn, or Lips, for 

 Lipsiae. Other frequently-recurring contractions are, for in- 

 stance — pi. for plantarum, sometimes also standing for plantae, 

 plantes, plantas, plants ; Entwickelungsgeschichte is invariably 

 expressed by Entw., which also occasionally stands for Ent- 

 wickelung simply ; cat. for catalogus, and its modifications 

 catalogue, catalogo, will also be known at once ; and the 

 occasional shortening of other words, familiar in so many 

 book-lists, as not to need a tabular recital of them. 



The size of the various books must be regarded as only 

 crudely hinting at the size of shelf demanded by the respective 

 volumes. With the varying sizes of paper now in use, the 

 number of pages to each sheet is wholly misleading ; many 

 modern octavos exceed the present volume in size, which 

 ranks as a quarto, and so with the other denominations. 



I have adopted the plan of spelling out the common diph- 

 thongs and modified vowels, ae, oe ; a, o, ii ; ; as ae, oe ; ae, 

 oe, ue ; oe ; I have not ventured do so with the Swedish a nor 

 Hungarian o, being unable to recall any weighty precedent for 

 so doing. Some may think it rash to adopt this procedure, 

 which has not obtained universal practice, but I am quite 

 ready to defend my course of action herein; had I chosen 

 otherwise, the same name must have figured in more than one 

 place, for instance, 0rsted, Orsted, (Ersted, Oersted, all used 

 for one and the same writer in various catalogues and title- 



