Bur and Catkin 



It always seems matter for surprise that the round burs 



of the chestnut should grow in catkins that seemed destined to 



produce fruit-clusters of a quite different type. Here is a picture that 



emphasizes the contrast, as it shows a well developed bur in 



connection with the remains of the catkin. As the stam- 



inate and pistillate flowers of the chestnut are 



borne in different clusters, cross polleniza- 



tion is very readily effected. 



