74 
These observations give the epoch of maximum == 
1866, April 18*5. 
39. $ Cancri . — My Ephemeris in No. 1593 of the 
<c Astronomische Nachrichten ” is proved to be very 
nearly correct by a well-observed minimum of this 
star 1866, November 29, 13 h 3 m M. T. Mannheim = 
12 h 42' '7 m M. T. Paris, at the earth’s mean distance. 
55. V Virginis . — A maximum 1866, April 13, occurred 
23 days earlier than my elements indicated, and a 
comparison with Mr. Pogson’s epoch for 1860 gives 
the period — 249 '4 days; but Goldschmidt’s earlier 
observations appear to show that the period must be 
increased to 251 days. 
59. S Bootis.—A careful examination of my observations 
gave a maximum 1865 July 11*5 ; and a good deter- 
mination of the following maximum gave the epoch, 
1866, April 17. The corrected elements will there- 
fore be — 1865, July 14-f 275 d E. 
63. 3 Librae. — Schmidt has communicated to me his 
observations of the past summer, which have enabled 
me again to improve this star’s elements. At the 
same time I satisfied myself on the 9th of June, 1866, 
that 2 h 8 m after the epochs given in my Ephemeris a 
second minimum occurs. I believe that the value 
multiplied by E in my new Elements 
Minimum 1866, April 12 15 h 25 m M. T. Paris 
+ 6 23 33 38-39 E 
is three times the value of the real period, which 
would therefore be = 2 d 7 11 51 m 12 -80 s , with a proba- 
ble error — ± 2 -057 s . This is a very interesting star. 
64. $ Serpentis .—- The maximum of this year occurred on 
February 26, or exactly one year after the preceding 
maximum. It appears, therefore, that the period is 
yet longer than that given by Argelander ; also, that 
