EUCALYPTUS TREES, 341 
Moderate irrigation is favorable. The plants, when ~ 
ripe, are cut off and stuck into the ground again until 
they become yellow. They are then heaped together 
for a few days in the drying-house. They are then 
packed in thin strata and placed in bags, for pressure 
and daily turning. 
Nicotiana quadrivalvis, Pursh. —The Native To- 
bacco of the Missouri. An annual. 
Nicotiana repanda, Willd.—Cuba, Mexico, Texas. 
Annual. It is utilized for some of the Havana tobac- 
cos. 
Nicotiana rustica, L.—Tropical America. Annual. 
Some sorts of Eastern India Tobacco, of Manila Tobac- 
co, and of Turkey (for instance Latakia) tobacco are 
derived from this particular species. 
Nicotiana Tabacum, L.*—The ordinary Tobacco- 
plant of Central America. Annual. Various districts 
with various soils produce very different sorts of to- 
bacco, particularly as far as flavor is concerned ; and, 
again, various climatic conditions will affect vastly 
the tobacco - plant in this respect. We can thus not 
hope to produce, for instance, Manila or Havana to- 
bacco in our latitudes, but we can anticipate to pro- 
duce good sorts of our own, more or less peculiar, or 
we may aspire to producing, in our rich and frostless 
forest valleys, a tobacco similar to that of Kentucky, 
Maryland, Connecticut, and Virginia, parts of Victo- 
ria resembling in climate very much these countries. 
Frost is detrimental to the tobacco- plant; not only 
particularly when young must it be guarded against 
it, but frost will also injure the ripe crop. Mr. Politz 
considers the scarcity of dew in some of our districts 
to militate against the production of the best kinds; 
