Lawson's Geometrical Theorems. 415 
mends, of inventing and deriving one geome- 
trical property from another, to an almost 
endless variety. I have sent you herewith a 
copy of the Pamphlet containing the theorems, 
as it may be thought necessary they should 
accompany the solutions. It is well under- 
stood that the author of the “ Dissertation” 
was the late Rev. John Lawson, B. D. 
I remain your’s truly, 
J. MABBOTT. 
Manchester, Jan. 8, 1812, 
Sse SE 
Mr. Wildbore’s Demonstration of Lawson's 
Theorems, &c, 
The author at page 18, of his Pamphlet on - 
the Analysis of the Antients, very justly ob- 
serves, that in the resolution of problems there 
is often need of a previous preparation, a kind 
of mental contrivance and construction, in 
order to form a connexion between the data 
and guesita. And I would not have it con- 
cealed that herein consists the great difficulty 
of this branch of science. Nor do I know 
any advice so proper to give’ the admirers of 
these rational amusements, as to endeavour 
to attain a facility of investigating or invent- 
