774 Scott. — On the Flowers of Spar mannia africana , 
It certainly would be a great advantage to be able to take 
photographs mechanically through the night, as unfortunately 
this plant, so far from following the human habit of sleeping 
through the night, seems to be peculiarly active between the 
hours of i and 5 a.m. 
For the overcoming of the fourth difficulty I am indebted 
to Mr. Kamm, who constructed a very accurate sight to the 
machine, by the use of which the elevation could be readjusted 
every morning. 
I will give a brief account of the kinematograph picture 
illustrated, Fig. 65. It was begun at 8.30 a.m. March 6, 1903. 
As many photographs as possible were taken of the bud while 
opening ; then it remained more or less stationary for some 
time, and photographs were only taken at half-hour intervals 
until the flower began to go to sleep, when regular photographs 
were again taken with longer and longer time exposures as 
the light decreased, and then by means of magnesium wire. 
The following morning photographs were taken by magnesium 
wire from 4.30 a.m. until sunrise (see Fig. 66), when time 
exposures were again taken. To show the movements of 
the stamens when touched, instantaneous photographs were 
taken by turning the handle of the machine as in ordinary 
kinematograph work. 
After two days’ work another difficulty arises — the" flower- 
stalk elongates, so that if a new adjustment is not made one 
finds the future photographs show only the stalk. This is 
remedied by raising the stand of the Kammatograph with the 
help of a very accurate sight adjustable for any distance 
above 9 inches, and then starting again. Of course one loses 
the growth of the flower-stalk, but this is inevitable, unless 
a much larger photograph is taken, " which would involve a 
much more costly machine. 
The sensitized plate is then removed and developed just 
like an ordinary plate, and when dry the positive is printed 
from it in a few minutes. 
I must here state the one drawback to the use of this 
machine : there is no means of remedying a mistake. 
