3 | £ SCIENTIFIC NEWS. 



If the terminating figure of the power given be 1 or 6, t 

 last figure of the square root may be 1 or 9, in the first, and 4 

 or 6 in the second case, how is the right figure to be ascer- 

 tained ? 



Again, 25, 6/2, 3/5 — I want the cule root, according to 

 the rule given A=5 and B=5 — how is the process given by 



to be applied here ? for from - - -25 

 the millions given, if you dedoct 8 

 the cube of 2, the first figure of - — 

 the root, you have - - - 17 



^ which is to be divided by the two Jirst figures of thrice the 



square of 2— but 2x2X3=12 (17) 



12 



5 



1 is the quotient, but Q is the number sought : how is this ? 



Dr. Henry has requested the Editor to state, that Professor 

 Bezelius, in his able sketch of the present state of animal 

 chemistry, recently published, has committed an error in as- 

 cribing to Dr. H. the suggestion of the trial of magnesia in 

 calculous diseases -, and that the merit of the hint which led 

 to the successful experiments of Mr. Brande, belongs entirely 

 to Mr. Hatchett. 



Mr. Snart, Mathemetical Instrument Maker, 215, Tooley 

 Street, Southwark, has shewn me by a letter, that he invented 

 the Chondrometer described in our last, and supplies the 

 scale-makers and others with them, who have no pretensions 

 to the contrivance. He has likewise had the candour to re- 

 mark, that he subsequently found, that the same had been 

 used several years before. 



