.Y 
330 = Letter respecting Bonnycastle’s Trigonometry. 
lished by Longman and Co. and Vernor and Hood, in 1801. 
I do not, from this observation, by any means wish to ascribe 
to myself any of the merit attributed to Mr. Bonnycastle by 
the writer of the article im question, nor to put my work 
in competition with Mr. Bonnycastle’s; but I cannot suffer 
such a remark as the above to pass unnoticed, when I can 
clearly prove that a very considerable portion of Mr. Bonny= 
castle’s work is @ direct copy of mine. Exclusive of detached 
matter, there are npwards of seventy pages in which there 
are searcely ten lines in any one page which are not directly 
eopted from my work ; and in many pages not a single line 
nor figure but what is copied. For instance, pages 232 and 
233 are both entirely copied from different parts of my work : 
thus, example 2d, is my second example, p. 267; example 
3d, is my fourth example, p. 268. The note at the bottom 
of the page is taken from my article marked D, p. 268 ; and 
the xixth preblem is a copy of my first example, p. 255. In 
p- 255 of my Treatise is the following erroneous remark : 
** The sun’s parallax is about 9”, therefore his upper limb 
will appear in the horizon when he is 32’ 53” below it; and 
as his semi-diameter is 15’ 47”, his centre wilt appear in the 
horizon when it is 48’ 38” below.” Mr. Bonnycastle, in 
his note, p. 233, says the same. At p. 303 of my work, 
10° 46’ are stated to be equal to 43’ 40” of time; and this 
error is carried through my calculation: this Mr. Bonny- 
castle has copied at p. 250 of his treatise; and brings out 
my conclusion, though the calculation occupies two pages. 
All the astronomical problems in my work, the framing and 
calculation of which were attended with a considerable de- 
gree of labour, are adapted to the year 1796, at which time 
Texpected my work to be published ; and the ‘tables of right 
ascension, &c. useful in the solutions,” and already noticed, 
were collected from the Nautical Almanac, for the purpose of 
ilustrating the examples. Mr. Bonnycastle has adapted all 
his examples to the year 1796, and copied my tables altoge- 
ther; the intention of which ts too obvious to need any com- 
ment! Lastly, the geometrical figures in various parts of the 
book are hkewise the same as those in my work, as if pricked 
from my plates by schoolboys. Thus the figure at p. 111 is the 
same 
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