226 Analyses of Books, [Sept. 



With respect to the dimensions of the earth, and the length 

 of the quadrantal arc of the elliptic meridian, the author then 

 deduces, that 60850*17 fathoms is the measure of the degree on' 

 the equatorial circle ; and that " 5467756 fathoms is the length 

 of the quadrantal arc, which, reduced to inches, and multiplied 

 [divided] by 10,000000, we get 39-3677 inches for the metre at 

 the temperature of 62°, which falls short of the French metre by 

 •0032 inches, when reduced to the same temperature." 



** This conclusion is very satisfactory, and I hope that equal 

 success will attend my operations to the northward. I have 

 already measured another section, which extends to latitude 

 21° 6', having just returned from finishing it ; and when all the 

 necessary calculations and corrections are made, I shall draw out 

 an account of the whole, and forward it to the Royal Society at 

 a future period. The celestial arc has been determined by seven 

 stars, but there are many now out of my reach which I observed 

 in the beginning. 



" It may be satisfactory to the mathematicians in Europe to 

 know, that I am now advancing through Hindoostan ; and from 

 what I can learn from the different public authorities, I do not 

 apprehend any difficulty. They are all inviting in their letters, 

 and all seem desirous that I should go through their respective 

 districts. If my present arc be continued direct, it will pass 

 through Bopaul, and near Seronje, where I shall have again to 

 observe the stars, and measure a base ; and if Scindiah's country 

 be in a quiet state, my meridian will pass through Gualior, his 

 capital ; and my sixth section will terminate near Agra, on the 

 Jumna. I have made up mv mind to execute all this if I live, 

 and continue to have that flow of health and spirits which have 

 hitherto attended me. The result of such an extensive measure- 

 ment must be interesting to scientific men ; and I shall exert 

 my endeavours in doing justice to the work, and in giving a 

 faithful account of the operations." 



In concluding our notice of this paper, we cannot but express 

 onr earnest hope that some fully qualified person may speedily 

 be appointed to continue Col. Lambton's operations, as well in 

 the measurement of the arc, as in the extension from it of a 

 general survey of the country ; the latter undertaking we believe, 

 had already been commenced by Col. Lambton, and the present 

 state of our knowledge respecting the geography of Hindostan 

 imperiously requires its prosecution. 



V. On the Changes which have taken Place in the Declination 

 of some of the principal Jixed Stars ; 



VI. Appendix to the preceding Paper on the Changes which 

 appear to nave taken place in the Declination of some ofthefxed 

 Stars; and 



VII. On the Parallax of a Lyra. By John Pond, Esq. 

 Astronomer Royal, FRS. 



To giv€ a satisfactory account of these important papers 



