Nov. a, 1916 Freezing Point of Leaf Sap of Persea americana 265 
19. Nutmeg. A=i.38, P= 16.5, ^=29.52° 
Buds obtained from Hawaii, where the variety originated from a seed received from 
Guatemala. Two-year-old cion on West Indian stock. 
20. Seedling (36603). A=i. 38, P=i6.6, F— 29.52 0 
Budded tree. Original grown at Honolulu, Hawaii, from a seed imported from 
Guatemala. 
21. Seedling (19080). A=i.39, P—16.8, F—29.50° 
Tree introduced as a plant from Guatemala in 1906. 
22. Seedling (19058). A=i.40, P—16.8, F—29.48° 
Grown from seed introduced from Guatemala in 1906. 
West Indian type.—T his is the commonest type on tropical American 
seacoasts. Its precise origin is not known, but since it has been demon¬ 
strated by Collins 1 that the avocado was not cultivated in the West 
Indies in pre-Columbian times it must have been introduced to the 
islands from some point on the mainland. At the present day it is 
practically the only type grown in the West Indies, and it is known to 
be common in Colombia, Venezuela, Brazil, and Peru. It occurs in the 
Mexican lowlands and in Yucatan. Most of the avocados grown in 
Hawaii belong to this type, as do those of Tahiti, some of which are 
occasionally shipped to San Francisco. In south Florida it is the prin¬ 
cipal type cultivated, having been introduced probably from Cuba at 
an early day and planted on both the east and west coasts. In Cali¬ 
fornia its cultivation is very limited. It is found in the Canary Islands 
and has been introduced to India, but in this latter country avocado 
culture is of no importance. 
Horticulturally the most important feature of this type is its suscep¬ 
tibility to cold, which prevents its culture in any but the warmest 
sections of the United States. Experience has shown it to be severely 
injured by a temperature at least 4 or 5 degrees Fahrenheit higher than 
that required to injure the Guatemalan type. 
23. Seedling (26707).A=o.96, P=n.6, F=30.27 0 
Originated at Fulford, Fla. Budded tree. 
24. Seedling (26692).A=i.oo, P= 12.0, F=30.20° 
Originated at Santiago de las Vegas, Cuba. Budded tree. 
25. Seedling (26693). A=i.o 3, P=i2.4, F=3o.i5° 
Originated at Cocoanut Grove, Fla. Budded tree. 
26. Seedling (26704). .... A=i.o 3, P=i2.4, F=3o.i5° 
Originated at Miami, Fla. Budded tree. 
27. Largo (18730).A—1.04, P?=i2.5, F=3o.i3° 
Originated at Nassau, Bahama Islands. Budded tree. 
28. Seedling (26698)... A=i.o4, P= 12.5, F=30.i3° 
Originated at Fort Myers, Fla. Budded tree. 
29. Seedling (19297).A=i.o6, P=12.8, F=3o.09° 
Originated at Cocoanut Grove, Fla. Budded tree. 
30. Seedling (36270).A—1.07, P—12.9, F=30.07° 
Grown from seed of unknown origin. 
31. Seedling (26703)..A=i.o8, P= 12.9, F=30.o6° 
Originated at Buena Vista, Fla. Budded tree. 
1 Collins, G. N. Op. cit. 
