193 NOTICES OF BOOKS. 



sium and sodium; and as those contain 45-648 grains of chlorine, we 

 may deduce the following composition of the salt by calculation : 



2'18 

 13-83 



Sulphate of potash 



Carbonate of potash 



Chloride of potassium . . . . . .33*6 



Chloride of sodium 50*4 



lOO'OO 



" From the above results, it will be perceived that the peculiarity of 

 this vegetable ash consists in the large amount of chlorides contained 

 in it, which very well adapt it for the purpose to which it is applied, 

 and render it a tolerably good substitute for that essential substance, 

 common salt." 



NOTICES OP BOOKS. 



Hanstein, Dr. Johannes : Die Gesnebaceen des KoniglicJien Her- 

 hariimis und der Garten zu Berlin^ neUt BeobacMungen iiber die Fa- 

 milie im Ganzen. With 2 plates. (From the Linn^a.) 

 This work is in the form of a pamphlet in 8vo, containing 71 pages. 

 Of these 52 are devoted to general observations on the family of Gesne- 

 racecB^ and the remainder to synoptical tables of the tribes, subtribes, 

 and genera ; where the several species above alluded to are divided into 

 68 genera. Whatever may be the opinion of the necessity of multiply- 

 ing the genera to such an extent, and, as it appears to us, often on very 

 slight gi'ounds, the author has illustrated his meaning by excellent figures 

 of at least one of each genus. Rich as the Garden and Herbarium at 

 Berlin may be in individuals of this, we cannot but think that, had Dr. 

 Hanstein consulted other sources he would have found reason to modify 

 some of his views, and that he might advantageously have reduced the 

 amount of his erenera. 



Schuckardt, T. : Synopsis Stackhotjsiaceakum. (From the Linnsea.) 



To this natural family, already embracing tw^o genera, StacHousia and 



Tripterococcus, our author adds a third from the islnnd of Eottcncst, 



off the west coast of Australia, PloMostignia; P. Lehmanni, Schuck. 



Three new species arc contributed to the genus SiacUousia , and one 

 to Tripterococcus. 



