30 REVIEWS. 



highest authority. Indeed, so plain is its relationship to 

 Gronovia that Fenzl soon saw and corrected his mistake in 

 referring the genus to Calycerece. And if at this date any 

 should doubt that these are Loasaceous plants, let them turn 

 to the characters of Petalonyx, in the "Memoirs of the 

 American Academy," v., p. 319. 



Leaving these details, let us consider our pleasing prospect 

 in respect to the continuation (at least through the Dicoty- 

 ledonece) of the great work upon which the De Candolles, 

 father and son, and other excellent botanists, have bestowed 

 so much labor and talent. The great order of Eauracece was 

 to have been included in the present volume. It would have 

 extended the volume unduly. But, unfortunately, or fortu- 

 nately, as the case may be, Professor De Vriese has gone to 

 Java on a government mission without finishing the work ; 

 and the indefatigable Meisner now takes it in hand. It is 

 to form the leading part of volume xv., the Begoniacece by 

 De Candolle himself, and the Aristolochiacece by Duchartre 

 being apjiended, and perhaps the Euphorbiacece, also by De 

 Candolle, except the genus Euphorbia which Boissier under- 

 takes. The sixteenth volume is intended to commence with 

 the Lrticaccce proper, by Weddell, or the Jfonimiacece by 

 Tulasne. We are pleased to learn that Professor Anderson 

 of Stockholm is to elaborate the Salicinece. 



The other section of the sixteenth volume of De Candolle' s 

 " Prodromus " has just been issued. The two parts form in- 

 deed independent volumes, and are paged and indexed as such, 

 so that for all time botanists will have to quote D C. Prodr. 

 xvi. (I), p., etc., which is to be regretted, but there is no help 

 for it. The present (prior) part, of 450 pages besides 65 

 intercalated ones, contains the Buxacem and some other plants 

 excluded from the Euphorbiacece, by Dr. Miiller ; the Empe- 

 tracece by Alphonse De Candolle himself (Empetrum reduced 

 to one species, Corema of two, and a Ceratiola) ; Cannabinem 

 by the same (the Ulmacece and Artocarpece postponed not 

 being ready), the Urticacece (i. e. the Urticece) by Weddell ; 

 Piperacece by Casimir De Candolle (the Saururece made a 

 mere tribe, and the Pipereai mainly included under Piper of 



