NATURAL SCIENCES OF PHILADELPHIA. 
123 
MusA. Some plants turned slightly yellow; the genus was very lightly 
affected. 
Stkelitzia regina passed through the ordeal without injury. 
ZINGIBERACEiE. 
Zingiber, dry and unaffected. Curcuma were not affected. K(empferia, not 
affected. Amomum, dry and not affected. Hedychium, not affected. Alpinia, 
not affected. 
None of the genera in this order were visibly injured. Some few were in 
leaf at the time, but the greater part were dry and not growing. 
MARANTACE^. 
Maranta. None of this genus were affected. 
Calathea zehrina was not injured. 
ORCHIDACE^. 
Bletia, Cypripedium. These two genera were the only plants of this order 
directly exposed to the influence of the gas. They were not injured ; nor could 
any effect be perceived in such orchids as happened to be in the hot house near 
the door of the orchid house. Of the collection within the orchid house not one 
exhibited any change. 
COMMELYNACEiE. 
Tradescantia discolor has spread itself for a distance of more than twenty 
feet beneath one of the side tables in the hot house. No visible effects were 
observable. 
ORONTIACE^. 
Calla turned slightly yellow. 
PoTHOS crassinervis was not visibly injured. 
LILIACE^. 
LiLiuM all turned yellow. Gloriosa, dry and unharmed. Agapanthus all 
turned yellow. 
Velthemiia viridiflora was in flower at the time. The leaves turned yellow, 
but the plant soon recovered. 
Aloe. None of the genus were affected. Ornithogalum, dry and unaffected.. 
Lachenalia tricolor lost all its leaves and flowers ; recovered slowly. 
Cordyline congesta was not injured. 
Drac^na. Of several species in the hot house, none showed any change 
except D. Brasiliensis, which turned yellowish, but soon recovered. 
GYMNOGENS. 
CYCADEACE^. 
Cycas revoluta was not perceptibly affected. 
Zamia were not sensibly affected. 
PINACE^. 
Thuja were considerably injured in their entire loss of foliage ; they re- 
covered slowly. 
LiBOCEDRus Chilensis was not affected. 
TAXACE^. 
Taxus lost all their foliage, being near the leak. Their recovery was very 
gradual. 
ToRREYA were not affected. 
1858.] 
