268 
HAROLD’S DISCUSSIONS. 
are many facts which we do not know which would 
lead us to reason as we did about the strawberry and 
Fig. 122.—Wild strawberry. 
the nettle. Compared with the era of plant life on 
the earth, a man’s time of observation is as a grain of 
sand upon the seashore. 
There are some curious forms and devices which 
seem to have come about through artificial selection. 
The sage furnishes an interesting device for the dis- 
