THE FRESH-WATER AQUARIUM. 375 
not to be found there, but not so with small turtles, which 
at certain seasons of the year, especially in the fall, are 
quite common. There is, I believe, no place equally near 
Boston, which has so complete a collection of aquarial speci- 
mens as Fresh Pond. Worcester offers great advantages to 
the collector in its beautiful Long Pond, or, as it is recently 
called, Lake Quinsigamond. The pond itself has few plants 
on account of its depth, but if we follow it up to the river 
which helps to form it, and then to the other pond above, 
near the place where a few years ago the old mill house 
stood, we shall find all the specimens we could wish for. In 
this upper pond the plants, instead of growing with the 
various kinds, mingling recklessly together as usual, are 
found in a general way, with each kind in a large patch by 
itself as if some one had planted them so, making as it were 
an aquatic botanical garden. We may go in the opposite 
direction down the pond, a few miles below the bridge which 
Crosses it, until we come to the dam which separates Long 
from what is called Half-moon Pond. If it is midsummer, 
and early in the morning, we shall find ourselves surrounded 
by acres of water-lilies, beneath which are the desired speci- 
mens. All along from this dam, towards Grafton, a chain 
of shallow ponds connected by rivers invites our attention, 
and the scenery alone would be a sufficient inducement to 
bring the naturalist to the spot. The three kinds of plants 
which are the best suited for the aquarium, of all our na- 
tives, are Ceratophyllum demersum; Utricularia vulgaris, 
inflata, and minor; Potamogeton natans, Claytonii, and 
others, * 

‘eratophyllum: Hornwort. Sterile flowers of 12-24 stamens, with 1 
fhers. Fruit an achemium, beaked with the slender persistent style. Herbs growing 
“ Utricularia: Bladderwort. Li -parted calyx entire or nearly so. Corolla 
: . Lips of the 2-parted calyx 
Personate, the palate on the lower lip projecting, often closing the throat. Anthers 
Convergent, aquatic and immersed, with capillary dissected leaves bearing little blad- 

