212 Seventisic Intelligence. 
importance. For this purpose, all the rain, hail, snow, dew, and 
frost wes collected and ed for hydrogen ‘peroxide, the analysis 
being quantitative when possible. Further, at various times, 
especially in clear weather, artificial dew and frost were prepared 
and examin Careful meteorological records were kept during 
the entire interval at the adjoining observatory. The o was 
determine onbein’s ozonometer. ‘The results show 
that the quantity of rogen peroxide in rain varies fro 4 
to 1:00 milligram per liter; that the larger the drops, the greater 
the amount; that first rain after weather is poorer 1 
peroxide than that which falls later; that the peroxide is greatest 
when the wind is south and southwe st, that in the rain brought 
by the equatorial current being greater than that which falls in 
the rain produced by the conflict of this with the polar current, 
or brought by the latter current itself; that the relative quantity 
of peroxide in rain increases from the summer solstice to t 
autumnal equinox, and then diminishes ; that the quantity is not 
greater in rain which falls during a thunder-shower; and that 
during the four LEE, the absolute quantity of hydrogen peroxide 
aidiaed in the iters of rain which fell upon each square 
San less than one twenty-five millionth of this substance. In 
rtificial dew and frost, the amount of peroxide varied from 0°04 
to 0°05 mgr. per liter, Teaching on a bright moonlight night in 
summer 0°09 mgr. e amount increased with the altitude of 
the sun. The daily easetbin was reached between 12 and 4 
o'clock Pp. M., and the annual in the month of August. The 
amount is greater the lighter the temperature, the clearer the 
sky, the ao the absolute and the lower the relative humidity 
of the air. The author concludes that the peroside.s is co — 
in the air both free and in solution, to the extent, a 
i 0°000000268 «ec. in a liter. He also believes hak ‘contiei 
a an important part in its production. The experiments are 
itil in progress.— Ber. Berl. Chem. as, vii, 1693, Dec., ce se 
G. 
the oes b the vapors of potassium aad sodium 
bes fill 
a 
was in the red; the second, on was on the one et and the 
third, y, on the other of the D lines. These bands shaded off 
toward the red and resembled in general the bands of iodine. 
The position of the bands was approximately measured. Group 
s 
