[ 3 io ] 
The reft of this Treatife confifts in divers Calcula- 
tions and Tables of Intereft, and the Value of Annu- 
ities for Life on different Ages and Intereft 5 and 
concludes with an Explanation of the fame, and the 
Ufefulncfs thereof. 
London , Jan. 27. 1742. 
IV. A Letter from Mr . Jofeph Hobfon to 
Mr. Peter Collinfon, F. R. S. concerning 
the wonderful Increafe of the Seeds of Plants, 
e. g. of the Upright Mallow. 
Refpetted Friend , 
-Rend Jan. zj. TTTHEN thou waft fo kind as to 
1742 3* VV oblige me with (hewing thy 
curious Collection of Rarities, amongft other things 
there was, I think, an Ear of Guinea Corn, remark- 
able, as thou well obfervedft, for its large Number 
of Grains: Remembering this, and obferving here a 
large Plant of the common Upright Mallow , which 
I thought muft have a large Number of Seeds ; I had 
the Curiofity to count them, and have prefumed, on 
the Slendernefs of our Acquaintance, to fend thee 
an Account thereof j and fhall be glad, if the Trifle 
be in any degree acceptable ; as follows, viz. The 
Seeds being difpofed in Rings, I counted thofe which 
were upon the principal Stems, and there were 
*upon 
The 
