20 



BEPORT — 18G7. 



Translation. — Aug. 20, 11" audio". Air disturbed. Evening terminator 

 over Bessel. Linne a faint spot of light somewhat smaller than the crater 

 S. Galliis. The westerly hill-like nucleus of the light cloud = -Jg- S. Gallus. 

 The craters situated on the north-west of Linne had akeady exterior shadows. 

 The southern of these craters [I E'''^] was remarkably small, scarcely | of its 

 northern neighbour. 



1867, Sept. 18, 16". Mr. Carpenter, of the Eoyal Observatory, Green- 

 wich, observed the small crater with the great Equatoreal. His record is as 

 follows : — " The definition was very good indeed : the crater-form distinctly 

 visible : there was a delicate line of light running round the interior shadow, 

 indicating the slightly elevated nature of the crater." 



1867. Nov. 3, 5" 30"\ Mr. Peixce saw the small crater as a black point. 

 See ante, p. 13. 



1867, Dec. 4, 7" 30"^ G.M.T. Mr. Knott had a very fair view of the small 

 crater. The atmosphere was too unsteady to set the wii-es, but from the 

 known thickness of the webs Mr. Knott estimated the diameter to be about 

 l"-5. 



Projection of the Values in Table II. 



4" Eespighi 4"0. 



2" 



0" 



0-" 



i. 

 ft. 



% % 



£■ 05 



The vertical lines represent intervals of 30 days ; the horizontal, incre- 

 ments of 0"-5. Respighi's estimate, 4"-0, is not connected with the curve, 

 as it does not fall in with the other estimates. 



In the following Table the estimations of Schmidt on Dec. 13,1866, and Jan. 

 25, 1867, were of the shadow-projecting hill and the fine black point (see 

 foot-note on p. 18). These features were also seen by Buckingham. After 

 Feb. 11, the small crater was the object generally observed. The exact date 

 of Respighi's estimate is not given. 



