USES AND HABITS OF VINES 9 
ing them is -to show all the different modes of 
climbing. 
One of the most interesting points about the 
twining vines, which, as already stated, are in the 
great majority, is the fact that they vary as to 
the direction in which they twist. Start one of 
these twiners on something where it may easily 
be observed, a bamboo cane for instance, and it 
will always wind itself around the support in 
the same definite direction. The hop vine will 
start twining with the sun, as the hands of a 
watch travel. Though this would seem the more 
natural, the majority of twining vines twine in 
the opposite direction, from left to right. The 
common morning glory is one of them, the bean 
another. 
Another curious thing about these twining 
plants is that if one of them be allowed to grow 
above its support, naturally it will fall over in a 
sort of horizontal position, and then this part 
of the plant will revolve in its natural direction 
searching for something on which to climb. If 
you take a string and fasten it to anything, and 
then wind it around in one direction, it will twist 
and, in time, will curl up. Not so with twining 
vines; instead of the entire plant moving with 
one motion, there seems to be a separate motion in 
