EUCALYPTUS TREES. 427 
T. monococcum, L.—St. Peter’s Corn, which is hard- 
ier than most other wheats; exists in the poor- 
est soils, but produces grains less adapted for 
flour than Peeled Wheat. 
Tropzeolum majus, L.—Peru. This showy, peren- 
nial climber passes with impropriety under the name 
of Nasturtium. The herbage and flowers serve as 
Cress and also are considered anti-scorbatic. A small- 
er species, T. minus, L., also from Peru, can likewise 
be chosen for a Cress-salad ; both besides furnish, in 
their flower-buds and young fruits, a substitute for 
capers. <A volatile oil of burning taste can be distilled 
from the foliage of both ; and this is more acrid even 
than the distilled oil of mustard-seeds. In colder 
countries these plants are only of one year’s duration. 
Numerous other species, all highly ornamental, occur 
in South America, and a few also in Mexico. 
Trophis Americana, L.— West Indian Archipelagus. 
The foliage of this milky tree has been recommended 
as food for the silk-insect. In Cuba and Jamaica it 
is used as provender for cattle and sheep. 
Tuber estivum, Vittad.—The Truffle mostly in the 
markets of England. The white Britsh Truffle, Chai- 
romyces meandriformis, Vitt., though large, is valued 
less. In the Department Vaucluse (France) alone, 
about 60,000 Ibs. of truffles are collected annually, at 
a value of about £4,000, Many other kinds of truf- 
fles are inuse. Our own native truffle, Mylitta aus- 
tralis, Berk., attains, sometimes, the size of a cocoa- 
nut, and is alsoa fair esculent. It seems also quite 
feasible to naturalize the best of edible fungi of other 
genera, although such may not be amenable to regu- 
lar culture, 
