VOL. LIX.] PHILOSOPHICAL TRANSACTIONS. 647 



least appearance of an atmosphere round the planet, supposing there really had 

 been one. 



By one set of observations, the latitude was found to be 47° l6' 51* north, and 

 by another 47° l6' 41". The place of observation on the island of Coudre, by 

 an actual survey, bears from Quebec, n. 41°30', e. by the true meridian, 

 distance 55 statute miles, = 52 marine ; which gives dif. latitude = 3Q' and dep. 

 34' = 50' dif. longitude = 3™ 20* of time between Quebec and Coudre. 



Remarks by the Astronomer Royal. 



The instruments made use of by Mr. Wright, in the foregoing observations, 

 were a 2 feet reflecting telescope; a pendulum clock beating half seconds; a 

 brass Hadley's sextant, of about 15 inches radius, with a magnifying glass to 

 read off the observations ; and a rectangular reservoir for holding quicksilver, 

 or any other fluid, which is sheltered from the wind by two glass sides inclined to 

 one another, and ground truly plane : this hst for taking the sun's double alti- 

 tude by reflection with the Hadley's sextant. By a more accurate calculation of 

 the times than Mr. Wright had used, I find the equation of corresponding alti- 

 tudes, for the noon of June ] to be — 5'''.0, June 2, — 4".5, and June 3 for 

 midnight -f- Q'.O., Hence the true time of noon, by the clock, June 1, was 

 12*' ig™ ICO; June 2, 12*' 18™ 20'.0 ; and June 3, midnight, 12'' ly™ IIM ; 

 and hence the true time of noon, June 3, should be 12*' 17'"34M, and the 

 clock is losing 46* per day on apparent time. Hence the apparent times of Mr. 

 Wright's 4 observations will come out as follows : 

 App. time. 



2*^ 31"* 53' No visible impression made by Venus yet. 

 2 32 56 Venus had made a small impression. 

 2 50 1 9 Venus appeared completely round to the eye, and rather detached, 



but joined by a ligament. 

 2 50 50 The rays of light appeared at the internal contact. 



Taking Isle Coudre to bear n. 41° 30' east from Quebec, distant 55 statute 

 miles, as, Mr. Wright says, was found by an actual survey ; the distance in 

 geographical miles is 47.65. Therefore the place of observation is 35' 41* north 

 of Quebec, and 3l' 34" east of it, =46' 32" difference of longitude, = S"* 6* of 

 time. 



XXXVII [. Extract of a Letter from Mr. B. Gooch, Surgeon of Shottisham^ 



near Nonvich. p. 281. 



May be consulted in Mr. Gtooch's work entitled Medical and Surgical Obser- 

 vations, published in 1773j being an Appendix to a former vol. under the same 

 title. 



It relates to a morbid separation of the cuticle from the cutis, from every 



