302 
POPULAR SCIENCE REYIEW. 
station 
Latitude 
Longitude 
E. of 
Greenwcli. 
Instrument 
to be 
employed 
Proportion 
of Clear Sky 
inbeginning 
ofDecember 
18. Aschuradeh 
36 54 
h ni 
3 35-8 
6-in. refractor 
Per Cent. 
80-90 
19. Naktritchevan . 
39 12 
3 1-6 
4-in. refractor 
90 
20. Erivan 
40 10 
2 58-1 
6-in. telescope 
90 
21. Tiflis 
41 42 
2 59-3 
4-in. telescope 
below 50 
22. Jalta 
44 30 
2 16-7 
4-in. telescope 
60 
23. Kertch 
45 21 
2 25-9 
3-in. telescope 
60 
24. Kazan 
55 47 
3 16-5 
9-in. refractor 
25. Nicolaiew 
46 58 
2 7-9 
4-in. telescope 
26. Odessa 
46 29 
2 3-0 
6-in. refractor 
27. Kharkow . 
50 0 
2 24-9 
4-in. refractor 
One station on the Russian territory will probably be occupied by 
American astronomers, namely, 
° ' h m 
28. Wladiwostok ] 43 7 { 8 47-7 [ American Photo- | 80-85 
heliograph 
At Nertschinsk and the other stations of Eastern Siberia the cold is 
rather strong ; but, according to Professor Schwarz, who has spent ten years 
in those parts, that cold is commonly accompanied with a completely calm 
and dry air, and thereby it is not unpleasant for astronomical observations ; 
with this conviction. Professor Schwarz has selected for himself the station 
of greatest cold, Nertschinsk. 
For nearly all the stations the observers are already designed, and will 
practise themselves this summer at Pulkowa in the use of their instruments. 
All the telescopes will have an equatorial mounting ; those designated as 
refractors are provided with clockwork and micrometrical apparatus for 
measuring the cusps, or the distances from the Sun’s limb. Personal equa- 
tions will be determined by help of an artificial transit apparatus. 
The telegraphic longitude determinations through Siberia will be ex- 
ecuted in the course of the next two years. The stations selected for that 
purpose comprehend several Venus stations, namely, Nertschinsk, Blago- 
weschtschensk, Habarowka, Wladiwostok, and Taschkent. The other 
stations can be easily joined with these by chronometric operations. For 
the stations near the Caspian and Black Seas, the longitudes are already 
known with sufficient accuracy. All the observers will be provided with 
instruments for the determination of time and latitude. 
Procyon as a Double Star . — Whilst M. Otto Struve was observing 
Procyon on March 19 last, under exceptionally favourable atmospheric 
conditions, he detected a faint point of light which followed Procyon at a 
very small distance, nearly on the same pal-allel. After ascertaining that 
this object was visible in the same manner in all parts of the field, and with 
cye-pieces of different power, he compared it micrometrically with the prin- 
cipal star. Three determinations of the position-angle, three measures of 
distance, and finally three more determinations of position-angle gave, with 
excellent agreement, distance = 11"*68, position-angle = 86°*8. The bright- 
ness of the small point of light (henceforth to be considered a companion of 
