REPRODUCTION BY SEED 49 
none at all, and we can find a very great deal of interest 
in trying to understand the arrangements for ensuring 
it, in case of need, in any given plant whose flowers 
bear both stamens and pistil. 
I do not, however, intend going very far into the 
extensive subject of pollination of either kind, because 
of all the problems of Botany it is, I suppose, the one 
that has attracted the greatest interest, at any rate 
so far as cross-pollination is concerned, and conse- 
quently so much has been found out and written 
about it that I need say but little, and I certainly 
do not feel that I can add anything new or do more 
than indicate what my readers should try to observe 
for themselves. 
Pollen grains have no power of their own to move 
away from the anther, but yet they manage to get out 
of it and on to the stigma. It is true that when the 
grains are ripe the anther opens, but that does not 
help matters much, especially when the pollen is too 
sticky and heavy to fall out or be blown away, as it is, 
for example, in the White Lily. 
Now, the only possible way for us to get about, 
were we paralysed and unable to move, would be to 
employ some locomotive agent, and this is precisely 
what the plants have todo. If we could neither move 
nor be moved there would be no alternative to remain- 
ing where we were, and as pollen grains cannot move, 
the help of a locomotive agent has to be invoked. 
It is not difficult to observe Nature’s locomotive 
forces. The wind drives the March dust and the 
October leaves before it, the rivers and streams carry 
all sorts of things on their waters, and the country 
teems with insects, birds, and other animals that are 
constantly moving/from place to place, and taking 
