18 Wilson—Observations on 
size of its cells and of the intercellular spaces, the parenchyma 
of the leaf stalk. In some of the cells are leucoplasts, but 
they are erratically distributed and not numerous. The clear - 
refractive bodies, probably a glucoside, mentioned as existing 
in the cells of the young flowering shoots, but absent from 
the adult stalk, are here very abundant. 
The bundles are collateral, as in the flowering shoot, lie 
parallel to each other, and vary in number from seven to 
eleven. Usually three of them are larger than the others. 
X. FLOWERS. 
The description of the flower has been already given, and 
allusion made to a rudimentary ovarian gland seen in a cross 
section of a young flower bud. This ovarian gland is particu- 
larly interesting in view of the fact that a well developed one 
is found in the adult flowers of Phelipea, which in this and 
many other respects, already noted, closely correspond with 
those of Conophols. 
The fruit of C. americana is a two-valved, single-celled 
capsule. On the middle of each valve are developed two- 
parietal placentz bearing numerous seeds of fair size. 
The seeds have well-developed endosperm, with small 
undifferentiated embryos. 
A detailed study of the floral structure and of the embryo- 
logy will be given in a later paper. 
The following is a brief summary of results: 
1. Conopholis is parasitic on the oak, and may form a fringe 
of growth round the trunk, at a distance of ten or more feet. 
2. It is perennial to the extent of at least eight to ten years. 
3. It first affects young roots, and usually starves the portion 
beyond the point of infection. 
4. The union between parasite and host is an extremely 
intimate one, the parasite being practically developed endo- 
genously within its host, which rises up and encloses it after its 
