1885.] Flow the Pitcher Plant got its Leaves. 571 
The fourth round of the ladder is Sarracenia variolaris (Fig. 5), 
and here is found a wonderful advance in structure. In the first 
place the hood bends over the orifice of the leaf and shuts out all 
rain. Secondly, the hood is marked on the posterior portion with 
white translucent spots and reticulations, and honey is there 
secreted. Thirdly, the fine velvety pubescence extends one-third 
way down the pitcher, and then the hairs become longer, coarser 
Fig. 7. 
Fig. 6. 
Fic. 6.—Leaf of Darlingtonia. Fic, 7.—Hairs of Darlingtonia; 4, base; a, top. 
and more bristly as the tube narrows. Fourthly, a secretion is 
formed at the bottom of the pitcher which has the peculiar prop- 
erty of asphyxiating insects so unfortunate as to fall into it 
Fifthly, there is found to be a honey-baited pathway running from 
the ground up along the wing of the leaf to the hood, and a short 
way into the orifice. 
These are many and curious changes. A marked advance 
