38 S. P. Langley— Observations on Mount Etna. 
Station, Catania. 
Stars sec ¢, |Log L 
Matched. Date. ¢ | Mag. |Log L.) co¢ we Pig log a.} a. 
Y Te Mal Dec. 23d, 1878 |45° 12%; 3°55 |—1-4 
¢ Urs. M 8) 53" M. T. 184 52] 2°71. |—0- 84 +9°76 |—0°58 |—0-059) 0°87 
6 Cassiop. | Dec. 23d, 1878 |28 49] 3°0 |—1-20 
7 Draconis 95 06" M. T. [79 25} 2:8 |—1-12/+4:30 |—0-08 |—0-019! 0:96 
y Cephei | Dec. 23d, 1878 |52 40| 3°55 |—1-4 
7 Urs. Maj. | 115 08™ M. T. |79 45) 2°07 |—0- 83 +3°97 |—0°59 |—0°149) 0-71 
B Cassiop. | Dec. 24th, 1878/21 27] 2°35 |—0-94 
8B Urs. Maj. 6417" M. T. |83 27} 2:1 |—@-84|+ 7-69 |—0-10 |—0-013! 0°97 
Mean | 0°88 
Station, Casa del Bosco. 
Stars sec ¢./Log L 
Matched. Date. a Mag. |Log L.| .o¢ e: Logliy. log a.| a. 
y Geminorum] Jan. 4th, 1879 |38° 46’; 2°6 |—1°04 
y Leonis S07 MT 119. 62) 21 0°84 | + 4°40 |—0°20 |—0°046| 0°90 
Mean of 8&4) Jan. 4th, 1879 | (12°) | (3°15) |—1-26 
urigae 
B Leonis 105 50™ M. T. [80° 10’) 2-1 |—0°84|+4-84 |—0-42 |—0-087]| 0°82 
¢ Tauri Jan. 4th, 1879 17 54) 3°55 |—1°42 
@Can. Ven. | 115 05™ M. T. [75 30) 3-07 |—1-23 | + 2-94 |—0-19 |—0-065) 0-86 
é Persei Jan. 10th, 1879}19 10) 3°25 |—1°3 
8 Can. Min. 65 53" M.T. |74 44) 3°15 |—1:° 26 +2°74 |—0°08 |—0°029) 0°94 
y Cassiop. Jan. 10th, 1879 |26 31) 2:1 |—0°84 
8 Urs. Maj. | 7 00™M.T. |75 57| 21 |—0-84/43-00|+40-00| 0-000! 1-00 
y Persei Jan. 13th, 1879 115 22) 3-07 |—1-2 Pe 
5 Ute Min. | tom ais. ‘les ar1 98; |ade +1°76|—0-07 |—0-040| 0°91 
Mean ' 0°90 
These general conclusions as to the clearness of the atmos- 
phere must not lead us to think that it is uniformly olen or 
that the deGnition | is uniformly good at such a mountain sta- 
tion, or that we have not to exercise patience and wait for oppor- 
tunity as well there as below. Thus I find such entries as 
these ee aon? 
one at home, ‘with no good view of faint oe ee though with fair 
definition,” ete. 
