i88o.] The Origin of Falling Motion . 367 
to question, seeing that he gave a lifetime of arduous study 
to their elucidation, made very numerous analyses of the 
atmospheric precipitates at different seasons of the year 
occurring in the vicinity of Rouen (1868) ; but he did not 
succeed in finding peroxide of hydrogen either in snow- or 
rain-water, nor in natural or artificial dew. 
But in the year 1874 Schone made an elaborate investi- 
gation of the subject, and obtained results which established 
that — in that locality at least, and at the time his experi- 
ments were performed — hydrogen peroxide was present in 
certain atmospheric precipitates. Of 130 samples of rain- 
water, collected during the latter half of the year 1874, at 
Petrowskoje, near Moscow, he found only four in which hy- 
drogen peroxide could not be detected. Of snow, of which 
twenty-nine samples were examined, there were twelve in 
which the presence of hydrogen peroxide could not be 
proven. As to the amount, Schone found that it varied in 
rain-water between one part in one million to one part in 
twenty-five millions. 
The problem how to detect with scientific certitude the 
presence of ozone, or peroxide of hydrogen, or both, in the 
excessively dilute condition in which — if ordinarily they 
exist at all — they must be present in the earth’s atmosphere, 
is still unsolved. And while its importance, as a leading 
fadtor in chemical and medical climatology, is on all sides 
generally admitted, there appears to be scanty prospedt of 
its speedy or satisfadlory settlement. 
III. THE ORIGIN OF FALLING MOTION. 
By Charles Morris, 
HY do bodies fall ? The attradtion of gravitation 
\ryir may be the adtive cause of their passing from a 
state of rest into a state of motion. But attradtion 
of gravitation does not create this motion. Nor can we 
well imagine gravitative energy to be a mode of motion con- 
vertible into other modes. However great the effedt produced 
the force of gravitation remains unchanged. It is not 
transformed into motion of masses. 
yoL n. (thirp series), 2 p 
