132 Mr. Schroeter’s new Observations 
many high points : moreover the clearing up or thickening of 
the atmosphere of Venus, which according to my former ob- 
servations is pretty dense, and 'the effects of refraction, may 
have a considerable influence on such phenomena. Whoever 
has frequently observed in the moon the very striking variety 
in the projections of the high ranges of mountains at her edge, 
namely, Leibnitz, Doerfel, or d’Alembert, will more readily 
comprehend such effects of a libration. 
The 1st, 2 d, and 3 d of March , bad stormy weather. 
The /^th, 6 h to 6 h 30', p. m. with 160 of the 7-feet Schr. the 
image being extremely fine, I found both horns equally rounded, 
without any difference. 
At 7*, the same. But at this time there appeared, in the 
enlightened part, a slight nebulous shade, which, as is ex- 
pressed in fig. 6, extended to the boundary of light. At 6 h , 
in the bright twilight, I had not remarked it ; and I suspected 
it to be a sort of dazzling, though the image appeared uncom- 
monly soft and distinct. The bad weather which came on soon 
after did not allow me to apply other magnifying powers and 
telescopes. 
March 5, at 4* 25' to 35'^. m. with the same power, I found 
the northern horn still rounded, and the southern somewhat 
pointed, but not strikingly so. 
At 4 11 40', with a power of 200, the same ; and moreover a 
weak shadow was again perceived on the planet. So likewise 
with 288 very distinct, and then with 370 extremely certain ; but 
on the whole it was not striking ; for the southern horn also 
appeared somewhat roundish, and probably another person 
less accustomed to such observations, would not have re- 
marked it. 
