Marcu 19, 1914] 
NATURE | ea 
of the blood corpuscles, phagocytes, and microbes 
in- human blood in a state of violent activity and 
warfare. Then there is a group of pictures taken 
from an American film, which was produced with | movement. 
Fic. 1.—Soldiers firing at the ‘‘ Life Target.” 
mechanism. From “ Practical Kinematography and its Applications.” 
the object of showing the actual movements of a 
highly-skilled mechanic, so that those who take | 
too long about their work might learn how to 
avoid useless movements. There is an account of 
the beautiful  in- 
strument of M. 
Bull described in 
Nature of July 28, 
1910 (vol. Ixxxiv., 
f° 112),; by “means 
of which _ stereo- 
scopic pictures may 
be taken at the rate 
of 2000 a_ second 
of such objects as 
a fly flying; and 
the somewhat simi- 
lar apparatus. of 
Prof. Cranz is also 
described. There 
is also an account 
of the most startl- 
ing development of 
kinematography. It 
is called the “Life 
Tareet..”  « Yn" this 
device a moving 
picture is projected 
on the screen; it 
may be, for in- 
stance, of cavalry 
crossing the screen or of an elephant charg- 
ing straight at the spectators. These are pro- 
vided with rifles and shoot at the screen. The 
explosion wave, by suitable mechanism, causes 
NO. 2316, VOL. 93] 
422 
The picture on the screen is thrown from the projector at right, and the 
picture is held stationary by the action of the report of the rifle caught by the microphone (marked X) upon the lantera 
Fic. 2.—The compressed air reservoirs of the ‘‘ Aeroscope ” camera. 1 Gos i 
From “‘ Practical Kinematography and its Applications. 
the film to be arrested for an instant only, when 
the bullet hole is clearly seen as a white spot, 
which disappears when the film continues its 
Other interesting pictures show the 
hi ait chin spon ea 
chick, a fight be- 
tween a lobster and 
an octopus, and 
many other things. 
A very good ac- 
count is given of 
the construction of 
several of the sim- 
pler machines, and 
in particular of the 
“ Aeroscope,” or 
moving - picture 
camera, in which 
air previously com- 
pressed in a light 
tubular reservoir by 
means of a bicycle 
pump’ drives . a 
minute engine and 
so moves the mech- 
anism at the de- 
sired rate, while the 
operator, having 
both hands free, 
may hold _ the 
machine up over 
his head in a crowd and secure at close quarters 
some stirring incident. It is with this instrument 
that Mr. Cherry Kearton has obtained some of 
his most wonderful results. 
<2 nee 
One charge is sufficient to expose 600 ft. of film. 
The methods used for developing and printing, 
of course, are described, but, curiously, no men- 
tion is made of colour work, whether two colour 
such as is so popular at the Scala Theatre, or 
