on the Planet Venus. 
*37 
was by that observation at 6 h 29'. From the QJth February , 
1793, 6 h 29' p.m. to the 13th March 11 h a. m. there are 13 days 
16 hours 31 minutes, -which, with the period of 23 hours and 21 
minutes, are resolved into 14,04 revolutions, exact to the very in- 
considerable fraction of which is so much the more sur- 
prising, as no attention could be paid to the inequalities. 
The same day at 6 p.m.. \ saw Venus with a power of 160, 
very sharp and distinct through thin clouds ; and found both 
horns again equally pointed, and the much fainter light at the 
boundary of illumination very evident. And the weather on 
the 14 tb of March, having been bad all day, I saw, together 
with my attendant, the same thing on the 
1 5th of March, at 6 h 30'. Both horns were then alike, and 
there was no spot. 
March 1 6th, <z h 15' to 45', both horns equally pointed ; no spot. 
To search with the greater certainty whether I could not dis- 
cover some inequality, I took the 13-feet reflector, and still 
found it as before, the image being uncommonly sharp. Thus 
one observation gives weight to the other against fallacy. 
From the 17th to the 21st of March, variable and cloudy 
weather. 
March 21, at 7 in the evening, with powers 160, 288, and 
even 95, of the 7-feet, both horns were pointed, without any 
perceptible difference : no spot. 
March 22 d, 2* 3 f p. m. the same. 
At 7 b in the evening, however, I found a sensible alteration, 
with 160, 209, 288, and 370 magnifying powers. The northern 
horn constantly appeared, according to fig . 10, not pointed as be- 
fore, but somewhat less obtusely rounded, whilst the southern was 
pointed and projecting a little beyond the line of the cusps . 
MDCCXCV. T 
