VOL. XXXV.} PHILOSOPHICAL TRANSACTIONS. 229 



and London, from whence he infers that the first of these cities is one-twen- 

 tieth greater than the latter, is founded on a false supposition, viz. that under 

 the parallel of Paris 20 degrees of longitude are equal to J 5 of latitude, and 

 consequently that by drawing meridians from 20 to 20 seconds, and parallels 

 from 15 to 15, the figures formed by their intersection will be perfect squares; 

 but Mr. Davall shows they are not. 



Mr. de Lisle has therefore, by this account, made the superficial content of 

 each rectangle, and consequently of the whole city of Paris too great by near 

 one-seventh. To confirm which beyond contradiction we have Mr. de Lisle's 

 own testimony, who in the plan he himself has drawn and published of Paris, 

 and which he refers to in this very account, has not made squares of the above- 

 mentioned figures, but has given to their respective sides the proportion of 8 

 to 7, which is as near the true one as can well be expressed by lines, in a plan 

 of no larger a scale than this. 



Now in the account, Mr. de Lisle says himself, that in his measuring of 

 London he drew squares, whose sides contained 15 seconds of a great circle, 

 and of these, he says, London contains fio. Therefore to compare Paris with 

 London, we ought to make an abatement out of the 63 rectangles which Paris 

 contains, nearly in the proportion of 8 to 7 ; but because that is a little greater 

 than the true one, let us make such abatement only in the proportion of g to 8, 

 which is pretty considerably less than the just one. By which abatement the 

 number of squares, whose side is 15 seconds of a great circle contained in 

 Paris, will be reduced from 63 to 56. And consequently, according to Mr. 

 de Lisle's own way of measuring, the magnitude of London will be to that of 

 Paris as 6o to 56, or as 15 to 14; or London will be one-fourteenth larger than 

 Paris. 



An Aneurism of the Aorta, dissected in St. Bartliolomeiv' s Hospital. By Pierce 

 Dod, M. D. N° 402, p. 436. 



The patient, of whom an account is here given, was about 34 years of age, 

 and of a good constitution ; but there was a tumour, larger than one's fist, 

 which began from the upper part of the sternum, between the origins of the 

 musculi mastoidaei, and extended itself to the pomum adami, almost up to her 

 chin, and possessed all the breadth between the two carotid arteries. 



The account she gave of the occasion of it was, that her husband, being a 

 passionate man, took her by the throat one day as she was crying out upon 

 some occasion or other, and griped her so hard as almost to throttle her. She 

 was then with child, and immediately perceived something of a pain a little above 

 her heart, and a few days afterwards a tumour appeared about the size of the top 



