(119) 
pendages move about as a result of changing conditions of 
moisture and these mechanical movements assist in scat- 
tering the spores. A somewhat analogous device is found 
in connection with the spores of the equisetums or horse- 
tails, though the appendages in this case are attached to 
the spores. Near the slide illustrating this feature of the 
horse-tails is one showing the spores and spore-cases of the 
common polypody; the spore-case here is provided with 
a sort of spring, by the action of which the spores are 
violently ejected, catapult-fashion. Another preparation 
shows the structure of the stem of the moonwort (Botry- 
chium) as it appears in a cross section. And yet another 
shows a cross section of the submerged stem of an aquatic 
plant with its large air spaces and poorly developed 
strengthening tissues. On the last table, at the left as 
one enters the landing, is a preparation showing “ pollen- 
grains” from the flowers of a shrub of the mallow family, 
the grains being in this case globular and covered with 
small sharp points. Grains of this sort are carried by bees 
from the anthers of one flower to the stigma of another, 
thus resulting in cross-fertilization. The last slide illus- 
trates the structure of the wood of a young pine stem in 
cross section and brings out clearly the anatomical basis 
of the annual growth rings. 
(c) Local Flora. In this collection it is designed to 
illustrate every plant-species growing naturally or without 
cultivation within one hundred miles of New York City. 
For the most part specimens of the plants themselves are 
used, but in cases where the structure of the plants renders 
this method undesirable, or impossible, a photograph or 
a drawing is substituted for the plant-specimen. This 
collection is displayed in swinging frames which are placed 
so as to correspond in a general way to the sequence of the 
cases of the synoptic collection already described; thus, 
the first stand is near the first museum case as one enters 
the west hall from the top of the staircase. All of the 
plant groups are here represented by those members that 
