109 



These equations indicate very clearly a negative value of i ; 

 considering the small weight of most of them, their agree- 

 ment is satisfactory, which, if the exponent X had been neg- 

 lected, would by no means have been the case. The sum of 

 the equation is s = 2007"*0 + 31 745*3 i; from which follows, 

 i= — 0"-063222; probable error =+O"-O03981. 

 [To be continued.] 



XVII. An Account of the Mesembryanthema Ringentia. By 

 A. H. Hawouth, Esq. F.L.S. $c. 



To Ike Editors of the Philosophical Magazine andjournal. 



Gentlemen, 



1J EREUNDER you will receive an improved account of 

 *- -* the sessile-flowered Mesembryanthema Iiifigentia, which 

 form, perhaps, one of the most interesting divisions of the large 

 genus to which they belong. « 



Some 



