bi 
‘ 
4 
4 
; 
; 
Chemistry and Physics. 413 
this question. But, judging on mere stratigraphical grounds, I 
cannot help thinking, that the Coal-measures of Liao-tung and 
Liao-hsi, and the lower portion of those in the neighborhood of 
Peking, will n ot differ much in age, ei ither among ae or 
ever, a noteworthy fact, that the coal formation of has an 
extraordinary development. I ha n to see those 
coal-bearing strata which lie immediately on the limestone. We 
of hese strata, together the limestone and a fi 
ments continu a considera riod, in whi fted 
to different — et, I must confess, t comparison 
i : 
gr 
tion of the Coal-measures of Northern China should be 
cent age as Dr. Newberry was inclined to conclude on the strength 
of the vegetable remains which he determined. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
1. On the influence of electricity on air and oxygen as a means 
of producing ozone—Hovzeav has drawn the following conclu- 
Sions from a seat number of estimations of ozone obtained by 
ae of Ruhmkorff’s apparatus. 
|.) The production of ozone is greater in air renewed from time 
to time than in confined air. 
(2.) It is greater at the negative than at the positive pole. 
(3.) The production of ozone pee only up to a certain 
with the duration of the ih ba actio 
: The ozone increases with the mee intensit 
The ozone diminishes aia the distance w iohi separates 
the  debsotea th increases. 
(6.) The hea of ozone varies with the a or surface 
of the electrodes 
