( 134) 
long: seta 1.5 cm. high, straight when dry, pendent when 
moist; capsule about 3 mm. long, curved, furrowed when 
segments one third height of teeth, broad and blunt at apex; 
stomata numerous at base of collum, about 35 » long: spores 
minutely roughened, up to 30 in diameter. 
La Paz, 3450 meters, August 18, 1901 (2766). 
The Dimensional Relations of the Members of 
Compound Leaves.* 
By CHARLES ZELENY. 
The present paper is the result of an experimental study 
of the regulatory changes taking place in the members of 
the compound leaf after removal of one of the leaflets. 
The object of the work was to throw some light on the 
general question of correlation of members in the plant body. 
The compound leaf of the palmate type was chosen as the 
most convenient organ for the study because of the compara- 
tive ease with which changes may be observed and quanti- 
tatively recorded. The method of procedure may be made 
more clear by a statement of the standpoint from which the 
subject was approached. 
The individual members of the compound leaf as well as 
of other parts of the plant respond to stimuli in a definite 
way. Each member is, however, limited in its reaction by 
its mechanical and organic relations to the other parts of 
the leaf. This limitation is mutual and as a result of it 
we get an equilibrium of forces which results in a configu- 
* The experiments were performed at the New York Botanical Garden 
during the winter of 1901-1902, under the direction of Professor D. T. Mac- 
of the work. A preliminary report of the results was given in a paper rea 
before the Botanical Society of America, July 1, 1902. 
