75 
this inequality of the period begins to show itself as 
a periodical one. 
71. R Scorpii. — Maximum, 1866, May 5.— The observa- 
tions commenced only on the 24th April, but are not 
unsatisfactory. However, it is possible that this 
maximum (11 mag.) was by no means the proper one, 
but only a secondary one during the waning of the 
star, and that the proper maximum occurred much 
earlier. 
72. S Scorpii.—" Maximum observed 1866, June 17, toler- 
ably good. Interval from previous year’s maximum 
—.355*5 days. 
77. S Ophiuchi. — -The elements are better than I expected, 
for they gave a maximum on the 20th June, 1866, 
whilst the epoch from my observations was June 24*5. 
78. S Herculis. — Last maximum 1866, October 11, ap- 
parently good, but 11 days earlier than the Elements 
give. 
89. — -T Sagittarii. — The epoch of maximum for this year 
as concluded from the course of the light-curve is 
September 14 but I had no observations of this 
star from August 23 to September 28. I believe, 
however, that the result given cannot be many days 
in error. The period appears, therefore, to be rather 
less than one year. 
90. — R Sagittarii. — Observed maximum 1866, July 13. 
The period is therefore 26 9f days. Dr. Auwers had 
already informed me that Pogson’s number, 467 days, 
was erroneous. 
91. S Sagittarii. — Maximum 1866, October 4*5, very 
good. The period is to me still unknown. 
101. R Delphini ( S Aquilce). — Observed maxima 1865, 
August 30*5 ; and 1866, May 27*5. Interval 270 
days. Although both determinations are good, the 
period, if regular, cannot be under 279 days. 
