NATURAL SCIENCES OP PHILADELPHIA. 
125 
TILIACEiE. 
Sparmannia. A large old specimen of S. Africana lost all its leaves and 
flowers. It had to be cut back, and recovered slowly. 
TREMANDRACE^. 
Tetratheca Hugelii lost all its leaves — recovered slowly. 
Tremandra ericoides dropped both leaves and flower-buds — recovered 
slowly. 
POLYGALACE^. 
PoLYGALA oppositifolia, p. Dalmasiana, and others, were quick in feeling the 
deleterious influence of the gas. They lost all their leaves and flowers, had to 
be closely pruned, and were slow in regaining their strength. 
Muraltia Heisteria, quickly lost all its leaves and flowers ; it never recovered, 
but lingered a short time, and died. 
ACERACE^. 
Acer. A row of silver maples (A. dasycarpum,) planted along the pavement 
on Eighteenth street, stood directly in the way of the current of escaping gas. 
They vegetated as usual in the spring, and grew vigorously through the season. 
The depth of frozen earth enveloping their roots, caused the gas to flow beneath, 
without doing them any injury. 
MALPiaHIACE^. 
Malpighia coccigera was stripped of every leaf, but recovered. 
Stigmaphyllon ciliatum lost all its leaves, recovering slowly. 
TERNSTROMIACE^. 
Laplacea was powerfully afiected. It lost all its leaves, and after lingering 
awhile with feeble vitality, died. 
Camellia. These were in the full glory of bloom. About one hundred and 
twenty varieties were distributed through the green-house, embracing many 
large old plants upon the upper staging. In a day or two after the entrance of 
the gas, not a leaf, bud, flower, or wood-bud remained upon the largest and 
finest plants. The leaves did not shrivel, nor did they change color. At the 
slightest touch they fell off in showers. Those nearest the roof suffered most 
severely. A plant, which to an observer would seem to be in healthful vigor, 
would lose every vestige of greenness in a moment, upon being slightly shaken, 
and appear like a naked dead shrub. They had to be cut back extensively, 
some to the main stem, but the largest and noblest specimens were too much 
injured ever to put forth again. Others vegetated feebly, and revived slowly. 
The nurture of years will be requisite to restore them to their former condition 
and appearance. 
Thea viridis was affected in the same manner, but recovered more readily. 
CLUSIACE^. 
Mammea Americana lost all its leaves, and was so badly injured that it died. 
MAGNOLIACEiE. 
Magnolia pumila and M.fuscata lost all their foliage, but recovered through 
the summer. 
Tasmannia lost all its leaves, and recovered again, 
FUMARIACE^. 
Dielytra spectabUis suffered considerably in the loss of its leaves and flower 
buds, but finally recovered. 
BERBERIDACE^. 
Berberis Darwinii lost all its leaves and buds ; recovered slowly. 
1858.]. 
