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the woods fringing the hemlock grove. This valley is about 
1,500 feet long and averages about 300 feet wide. A small 
stream runs through it from north to south and is here 
and there broadened out into pools. The plants are 
arranged in beds according to their natural botanical 
families. At the southern end are the seedless plants, 
represented by the ferns and their allies; east of the brook 
are the families of seed-bearing plants belonging to the 
large endogenous division, or those with parallel-veined 
leaves and with one seed-leaf (monocotyledons). To 
the west of the brook are the families belonging to the 
exogenous division of plants, or those in which the leaves 
are usually net-veined and which have two seed-leaves 
(dicotyledons); this latter group embraces the larger 
part of the plants in the collection. Along the brook, 
or in it, may be found many aquatic plants, representing in 
some cases families which are exclusively water-lovers, 
while in other cases they are aquatic representatives of 
families occurring in the immediate vicinity in the beds. 
In this plantation, the family groups are arranged sub- 
stantially in a sequence beginning with those of simpler 
organization and proceeding to the most complex. 
The series commences in the southern corner of the valley 
at the foot-path entrance, where the hardy ferns and their 
allies may be found, including species from many parts of the 
north temperate zone. Among these may be mentioned the 
ostrich fern, the cinnamon fern, Clayton’s fern, the royal 
fern, the brake or bracken, and a number of species of the 
shield-ferns and of the spleenworts. Some of the aquatic 
representatives of the ferns and their allies may be found 
in the pond nearby. 
In this pond may also be found the following aquatic 
endogenous families: the cat-tail family, the bur-reed 
family, the pond-weed family, and the tape-grass family. 
At the junction of the brook with this pond is the water- 
plantain family, including, besides the water-plantain, 
several species of arrow-head (Sagittaria). A little be- 
