128 Mr. herschel’s Agronomical Obfervations 
Obfervations on Mars in the year 1 779. 
May 9th. Clock too faft ; by equal altitudes on the 
14th of April, and by the tranfit of a ftar, is found to lofe 
1 ',45 per day. 
11 h. 1' by the clock, I found the fituation of the fpots on 
Mars as in figure 20 ; there is a very remarkable dark fpot not 
far from the center. 
1 1 h. 30'. The figures are gone from the center. 
May ii. Clock 12" too faft. 
I oh. 18'. The fame fpot that was vifible May 9. is on the 
difk, the darkeft place being intirely fouth-eaft of the center, 
fee fig. 21. 
I I h. 43'. The darkeft part is almoft arrived at the center, 
fig. 22. 
1 2 h. 1 7'. The dark fpot is with its edge juft near the center, 
as in fig. 23. 
May 13. Seven- feet refle&or ; power 222. Clock 9" too faft. 
11 h. 26'. Mars feems now to be In the fame fituation he 
was the nth, at 10 h. 8 r . 
May 22. Clock 4" too flow. 
1 a h. 5 / . The figure of May nth is not on the dilk ; but 
fome other fainter fpots are vifible. The air is full of vapours. 
June 6. The clock fet by ten equal altitudes taken to-day, 
and by the tranfit of $ Scorpii lofes 1^,9 per day. What I have 
perhaps improperly called a tranfit is the occultation of a ftar 
palling behind the perpendicular edge of a high building at 
about 40 yards diftance, obferved with a fixed telefcope dire&ed 
to the place where it vanilhes. 
10 h. io'. The fame figure is upon the difk of Mars which 
was there April 8, 17 77, at 7 h. 30'. 
June 
