1892.] Botany. 1035. 
point, from whence it makes rapid strides by the elongation of the cells 
of the filament; and for a time the stamen crowns the summit of the 
flower. So there is a similar phase of growth which characterizes the 
style; there is a slight cessation of its growth until the anthers begin 
to shed their pollen, when the style by rapid development pushes its 
way up through the syngenesious stamens, The lengthening of the 
style is due to the growth and elongation of the carpellary cells above 
the ovary. In this case is found a good example of proterandry, 
which indicates cross-pollination, After the opening of the flower the 
style lengthens and the pollen is pushed out of the anther tube by the 
brush-like upper portion of the style as the anthers dehisce. The lines: 
of the stigmatic receptive surface remain intact until that portion of 
the two branched style is shoved above the anther tube, whence the 
two branches separate, curving far back and exposing the stigmatic 
papillse on their inner faces; thus the style is made the instrument for 
disseminating the pollen which it cannot use for itself; as a result, 
cross-pollination, with almost absolute certainty, is insured. 
To speak further of the two-branched style: Two kinds of hairs are 
detected, viz., stigmatic papille and brush hairs. The former are 
usually short, being either acutely or obtusely tipped, and are confined 
to the inner faces of the style branches, while the latter are eylindri- 
cal, epidermal outgrowths, having various arrangements both on the 
inner and outer faces of the style-branches. In Aster the style- 
branches are flattened and linear from their bases to the ends of the 
two lines of papillæ which line each stigmatic surface. Above the 
termination of the stigmatic lines are seen brush-hairs which cover 
both faces of the style-branch. In Solidago the style-branches resem- 
ble very much in outline those of Aster. Two stigmatic lines are 
observed which extend from the base of the branch to a point about 
one-half the distance to its tip. The brush hairs usually cover the 
whole outer surface of the branch, and the edges and tip of the inner 
face above the termination of the stigmatic lines. 
It yet remains to speak of the tissue and its modifications that make 
up the structure of the style. It consists chiefly of ordinary paren- 
chyma, the central portion of which is modified parenchyma, while 
the upper stigmatic portion is a differentiation of the epidermis into a 
soft mucilaginous tissue, thus forming a loose conducting mass for the 
penetration of the pollen tube. In the center of the conducting tissue 
is also seen a very narrow tubular opening, indicating that it Is a conr, 
tinuation of the ovarian cavity. This seems to be constant throughout 
the species examined. Before concluding, however, the description of 
