the Longitude ly Lunar Observations. 223 



'tJf'* "°^ .?"''^'' ^"/'■'*°'" ''^'^^"^ °^ «'§''' "Minutes of longi- 

 tude unworthy of avoiding ; and a much greater error may some 



loT-'Ver. ""' ^ neglecting the quf ntity under c^UZt 

 tion. Let these three extracts be compared 



But even supposing the deduction from the vertical semidia- 

 meter omuted, as it usually is in the « slovenly" practice oT ma 

 rmers at sea it is right to observe again that the error of the Z- 

 reciton of altitude at 6" or 7° is only the change of parallax ami 

 refraction corresponding to a change of IS" in altitu^de Mr. M 

 perhaps knows how small a part of 18" this change of correc- 



He says in the last place, that I have « reluctantly admitted" 



hat he correctly stated the errors of certain tables/ Herraiia 



s a m,s-s atement. I pointed out one table which had the e. 



ror which he imputed to several, and I know of no other such ct 



roneous table. He was declaring such tables general^ to TeLZ'o 



than useless, and he mentioned a specific enor thai I showed to 



t " r"ori: '£]:H In" " ''' '''' '^"^^ ^Sain refeZf to 

 me error in that table. If he cannot point out other tables nn,v 

 jn use among mariners, which have the - gross errL'' which I 

 found in that one, he will find it difficult to show that he has n .t 

 made a dismgenuous use of his argument. If he can point o t 

 any other such erroneous tables nol in use among nautica ne 

 he is entitled to the credit-to the benefit of the discovCy. ' 



I am, sir, your obedient servant. 

 Trinity House School, Newcastle, Edwarti R ir,r.r r- 



8th JanuaiT, 1820. -^i^WARD KiDDLE. 



XXXIII. Notices respecting New Books. 



Lately published, 



iu'l "'^^""^t^ ^"^ Statistical Account of the Principalities of 

 Wallach.a and Moldavia, with Political Observations. By Wii- 

 hara Wilkinson, Esq., late British Consul to these Principalities. 



Brackendridge's Voyage to South America. 2 vols. 8vo. 



2/.'^12j!\i*'^^''''"'"''^^"I!!L^ J^. lb.6i. India proofs, 

 Vitruvim Britannicus. Imperial folio, vols. 4 and 5, 10/. 10^. 



In the Press. 

 Mr. James Grey Jackson, late British Consul at Santa Cruz, 

 bouth Barbary, and resident Merchant uj)wards of sixteen years 



111 



