A. Woethkof—Mean Annual Baird 341 
to the fact that he had placed his slit on a different region of 
the watery or to his employment of a reflector and Iceland spar 
prism, to the use of a different sensitive preparation. 
Baventeion: my reference spectrum extends beyond the 
region in question 
As illustrating the delicacy of working required in this re- 
cerned. It is only a short time since it was considered a feat 
to get the image of a ninth magnitude star, and now the light 
of a star of one pienasnen less may be ‘photographed even 
when dispersed into a spectrum. 
271 Madison avenue, New York. 
+ 
Art. XXXVI—Mean Annual Rain-fall for different Countries of 
the dais by Dr. ALEXANDER WokErKor of St. Petersburg, 
Russ 
PROFESSOR K. ee having 2 ee in this Journal a 
ology, paper xvi), inviting meteorologists to give upplemen tary 
information on subject, readily. accept this invitation, 
having myself given yes  dentiok to the subject. t 
fessor Loomis, when he was drawing his lines of at rain- 
the sheaphioe configuration and notices of A are the 
only objects which give a basis to the pee ee I will give 
only examples in relation to Africa and Asia. On the first 
Continent not only are none rat the ‘equatorial lakes given, but 
tence. In Asia the Stanovoi watershed between the systems 
of the Lena and Amur is given as if it was a high mountain 
chain; the same is to be said of the slope of the rT 
plateau north of Pekin, while between 25°-40° N. and 96°-110° 
K., no mountains are shown, while this region comprises West 
China, Kukunor ae Eastern Thibet, and has some of the 
highest chains of 
me now to Pratencr Loomis’s work in Europe. ‘The 
Shades are mostly right, except— 
1. Sicily, which has, in its greatest part less than 25’, 
2. Portugal, where the author cites the old and « erroneous 
