THE WHITE SPINES. 201 
develops into frosty patches. When it appears, dry off 
the house, raise the temperature, and give plenty of air 
(without any draughts). It is also a good plan to dust 
the foliage thoroughly with powdered sulphur. If the 
disease threatens to become serious, sulphur should be 
evaporated in the house. Flowers of sulphur is placed 
in a small basin and set upon a small oil stove (Fig. 31, 
page 92). The house is tightly closed, and enough 
sulphur is evaporated to completely fill the house with 
strong fumes for a half hour. Care must be exercised 
that the sulphur does not take fire, for burning sulphur 
is very injurious to plants. 
THE WHITE SPINE TYPES OF CUCUMBER. 
The forcing of the White Spine types of cucumber is 
not greatly different from that of the true forcing types. 
The chief points of dissimilarity to be borne in mind are 
these: The White Spine types are shorter-lived than the 
others, and tend to ripen up their crop at once; they 
are less succulent in growth, and demand full sunlight 
for their best development; they can be readily grown 
under glass in summer, after the house is cleared of its 
winter crops, thereby giving a crop much in advance of 
the outdoor plants; they seem always to require pollina- 
tion, either by hand or by bees; they are less rampant 
growers, and bear smaller leaves than the others, and 
may, therefore, be planted somewhat closer. 
With these contrasts in mind, the reader who has 
followed the discussion of the English cucumber in the 
preceding pages will have no difficulty in apprehending 
the essential points in the management of these Ameri- 
can cucumbers. The plants will mature the crop in 
about three months from the time they are put on the 
benches. A certain house of 68 plants yielded, in three 
months, 6,180 fruits, or an average of go to the plant. 
This was possible because every fruit was picked the 
