lobes composed of them. But as it would be contrary 
to all experience to find spiral vessels radiating at right 
angles from the testa, and constituting the whole substance 
of its lobes, a more minute. examination is necessarily 
suggested. And upon dissecting the tissue very carefull v, 
it is seen that these apparent bundles of spiral vessels are 
cellules of a kind hitherto unobserved. They are of various 
sizes and figures, varying from nearly spherical to fusiform, 
and possessing all intermediate forms. The smallest are 
nearly round, composed ofa net-work, the meshes of which, 
from their proximity to each other, are almost undistin- 
guishable. In this state the cellule appears to be formed 
of spiral threads, crossing each other, and interlaced from 
the base to the apex. But in the larger cellules, which 
have become lengthened out from a round to a fusiform 
figure, the meshes are distinctly visible, as they would be 
in a round, closely-netted, elastic purse, pulled out to its 
utmost length; in this state it is also apparent that the 
meshes are connected by a membrane,—a character which 
could not be ascertained in the small cellules. This kind 
of tissue, which has never before been described, we pro- 
pose to call reticulated cellular tissue: its functions are 
wholly unknown; and from the excessive minuteness of its 
cellules, more than 200,000 of which would be required to 
cover a square inch, they are not likely soon to be dis- 
covered. There is no doubt, -however, that this singular 
deviation from the usual structure of the elementary organ 
of plants has not been contrived without some wise end 
in view. 
Leaves alternate, on long stalks, angular, cordate, acumi- 
nate, quite smooth on each side; the younger somewhat 
sagittate: petioles longer than the leaves, twining. Flowers 
axillary, solitary, with smooth, filiform peduncles, longer 
than the leaves. . Calyx 5-parted, covered all over with 
long glandular hairs; the segments with long points, of 
equal size, the three upper ones ascending, the two lower 
placed below the tube. Corolla about 3 inches long, deep 
purple, downy on the outside, quite smooth inside, tubular- 
campanulate, personate ; the upper lip with two transverse 
rounded lobes, the lower with three roundish ovate divi- 
sions, of which the middle one is the narrowest ; palate 
plaited, prominent ; throat pervious; tube greenish, saccate 
at the base, in front. Stamens 4, didynamous, inserted 
