14 BULLETIN 30, PORTO RICO EXPERIMENT STATION. 
they averaged 35 inches in height, and for the three following years 
52, 68, and 82 inches, respectively. At this time, five years from set- 
ting, the 16 tallest trees were 10 to 13 feet high. 
In general appearance the tree differs noticeably from the typical 
Arabian, due to its short internodes and much smaller fruit and 
foliage. In some instances the entire branch ranges from two-thirds 
of an inch to 1J inches in average internodal length, while individ- 
ual internodes measure one- fourth of an inch to 3 inches. The leaf 
is elliptical in shape with acute apex and base. In length it varies 
from 2J to 4 inches, and in breadth from three-fourths of an inch to 
1^ inches. 
The Mocha crop at the station matures in a comparatively short 
season, 89 per cent having been harvested in September and Octo- 
ber. For the period as a whole, the crop was the earliest harvested 
of the varieties compared. The maximum average annual yield was 
2.9 liters of coffee cherries per tree, and the average annual yield 
for the period, 1.1 liters. The cherries are the smallest of any in 
the Arabian group, four samples of 1 liter each containing between 
503 and 582 cherries, with an average of 543. An almud of cher- 
ries weighing 28 pounds 7 ounces gave 5 pounds 3 ounces of market- 
able coffee, a reduction in weight in the ratio of 5.5 to 1. A pound 
of this lot contained 5,021 beans while a pound from the crop of 
another season contained 6,273 beans. In a comparison of samples 
of 1,000 moisture- free beans, the Porto Bican (Mayaguez) bean was 
found to be one and three- fourths, and the Maragogipe three times 
as heavy as Mocha. (See Table 3.) The flat face of the Mocha is 
more rounded in outline than is the Arabian type. Representative 
beans grown at the station measure from 5 to 8 millimeters long by 
5 to 6 millimeters broad, the breadth sometimes equaling the length 
in the smaller ones. In cup quality, Mocha is excellent. 
The variety is not recommended for commercial planting for the 
following reasons: Although it is typical Mocha coffee and alto- 
gether distinct from other coffees, it can not be marketed as Mocha 
under the existing laws. Moreover, while the quality is excellent, 
the cherries are so small that the number contained in a given meas- 
ure is nearly double that of Porto Rican coffee, and this alone would 
double the cost and difficulty of picking. 
MURTA. 
Laliere 23 states that Murta is characterized as a degenerate varia- 
tion of Bourbon and is grown in Brazil. Graham 24 lists it last of 
the six principal varieties grown in the State of Sao Paulo. At the 
station it has proved to be a mongrel, 25 approximately half the seed- 
lings being of the Murta type, the others ranging from small dwarfs 
with many upright branches resembling tiny green rosettes to the or- 
dinary Arabian type. (PL V, fig. 2.) The fully developed Murta 
tree is 7 to 9 feet in height, with a spread of about 4 feet. (PI. VI, 
fig. 1.) . The internodes are short, those of a representative tree 
measuring little less than 1J inches for the upright and about five- 
23 Le Caf4 (Bresil). Amour Laliere. 1909, p. 40. 
24 Coffee : Production, trade, and consu motion bv countries. U. S. Dept. Agr. Bur. Sta- 
tistics Bui. 70, p. 14. 
25 Porto Rico Sta. Rpir. 1916, p. 22. 
