Cuap. I. TWINING PLANTS, 5 
segment of a circle. After the seventeenth revolution 
the internode had grown from 1? to 6 inches in length, 
and carried an internode 12% inch long, which was 
yorceptibly moving ; and this carried a very minute 
ultimate internode. After the twenty-first revolution, 
the penultimate internode was 24 inches long, and 
probably revolved in a period of about three hours. 
At the twenty-seventh revolution the lower and still 
moving internode was 83, the penultimate 34, and 
the ultimate 23 inches in length; and the inclination 
of the whole shoot was such, that a circle 19 inches 
in diameter was swept by it. When the movement 
ceased, the lower internode was 9 inches, and the 
penultimate 6 inches in length; so that, from the 
twenty-seventh to thirty-seventh revolutions inclusive, 
three internodes were at the same time revolviyg. 
The lower internode, when it ceased revolving, 
became upright and rigid; but as the whole shoot 
was left to grow unsupported, it became after a time 
bent into a nearly horizontal position, the uppermost 
and growing internodes still revolving at the extremity, 
but of course no longer round the old central point of 
the supporting stick. From the changed position 
of the centre of gravity of the extremity, as it revolved, 
a slight and slow swaying movement was given to the 
long horizontally projecting shoot; and this movement 
I at first thought was a spontaneous one. As the shoot 
grew, it hung down more and more, whilst the growing 
and revolving extremity turned itself up more and more. 
With the Hop we have seen that three internodes 
