42 
differential character in being glabrous (sometimes a few hairs are 
found at the extreme tip) instead of hairy as in the contrasted 
plant, this feature reversing the character of the stem and leaves 
of the two species. 2. adbortivus thrives under widely different 
conditions, and is to be found equally at home on rocks, wooded 
banks, or in low grounds. RR. micranthus is evidently a species 
adapted to a more narrow environment. I have found it growing 
only in light rich soil—often in black earth—which has lodged 
in depressions or crevices in rocks usually in exposed situations in 
high open woods. Such places it often occupies in close com- 
munities. I have occasionally found adortivus growing with it, the 
two plants showing not the slightest tendency to intergrade. 
Furthermore, 2. micranthus comes into flower somewhat later 
than adortivus. | 
E. P. BICKNELL. 
RIVERDALE ON Hupson, NEW YorK. 
Proceedings of the Club, 
TurspAy EvenInGc, DECEMBER 12TH, 1893. 
The President in the chair and twenty persons present. 
The following report of the Instruction Committee for 1893 
was presented and accepted : 
Since the last report of this committee the courses of instruc- 
tion then announced, commencing April 27 and ending June 29, 
have been given as follows: 
Dr. Thomas Morong, who conducted the general course, states _ 
that his class consisted of 28 members, the greater part of them 
from this city. The interest of the members was excellent, as 
was the attendance until the latter part. Of the course more than 
three-fourths of the members were always present until about the - 
middle of June, when the attendance fell off more than one-half, 
owing, according to information, to the removal of many of the > 
members into the country. | 
Two excursions were made each week, and these were even 
more highly enjoyed and appreciated than the lectures. Asa 
means of imparting direct and familiar instruction, and of meeting — 
the practical difficulties of the students, such excursions are indis- 
pensable. ae - 
Only two candidates for diplomas presented themselves for ex- 
amination at the close of the course, although several others have 
