103 Mr. Knight on the Direction of 
rest ; and as gravitation and centrifugal force also acted in 
lines parallel with the vertical motion and surface of the 
wheel, I conceived that some slight objections might be urged 
against the conclusions I felt inclined to draw. I therefore 
added to the machinery I have described another wheel, 
which moved horizontally over the vertical wheels ; and to 
this, by means of multiplying wheels of different powers, I 
was enabled to give many different degrees of velocity. 
Round the circumference of the horizontal wheel, whose dia- 
meter was also eleven inches, seeds of the bean were bound 
as in the experiment, which I have already described, and it 
was then made to perform 250 revolutions in a minute. By 
the rapid motion of the water-wheel much water was thrown 
upwards on the horizontal wheel, part of which supplied the 
seeds upon it with moisture, and the remainder was dis- 
persed, in a light and constant shower, over the seeds in the 
vertical wheel, and on others placed to vegetate at rest in 
different parts of the box. 
Every seed on the horizontal wheel, though moving with 
great rapidity, necessarily retained the same position relative 
to the attraction of the earth ; and therefore the operation of 
gravitation could not be suspended, though it might be coun- 
teracted, in a very considerable degree, by centrifugal force : 
and the difference, I had anticipated, between the effects of 
rapid vertical and horizontal motion soon became sufficiently 
obvious, The radicles pointed downwards about ten degrees 
below, and the germens as many degrees above, the horizontal 
line of the wheel's motion ; centrifugal force having made 
both to deviate 80 degrees from the perpendicular direction 
each would have taken, had it vegetated at rest. Gradually 
