COFFEE VARIETIES IN PORTO RICO. 23 
accounted for by the crossing of two closely related strains. Leaves 
may vary from 7£ or 9 to 10 or 12 inches in length, and from 2J or 3 
to 4J and 6 inches in breadth. Usually the cherries are striped, but 
some appear solid in color, being a lighter red and slightly smaller 
than those of G. robusta. 
One tree, received from the French Government in 1906, has fruited 
heavily in some seasons, giving a maximum yield of 14 liters of cher- 
ries at a single picking. (PL XI, fig. 1.) Two plantings have been 
made of G. canephora, one of 24 trees from seed sown in the last quar- 
ter of 1914 and the other of 60 trees from seed sown a year later. Seed 
of the latter and part of the former came from the Java Experiment 
Station. The yield of the two plantings is shown in Table 6. 
An almud of cherries, weighing 29 pounds at picking, gave 6 pounds 
6 ounces of marketable beans, or a reduction in weight in the ratio of 
4.5 to 1. Another almud picked in a different season, weighing 29 
pounds 8 ounces, gave 7 pounds 6 ounces of marketable beans, or a 
reduction in weight in the ratio of 4 to 1. Counts of six samples 
showed between 552 and 704 cherries per liter, with an average of 654. 
Twenty-five unselected beans from a large and representative lot of 
C. robusta and G. canephora coffee were measured for purposes of 
comparison. In length, breadth, and thickness, G. robusta averaged 
S.7, 7, and 4.4 millimeters respectively, and G. canephora, 8.2, 6.6, and 
4.2 millimeters respectively, showing the latter to be the smaller in 
each of the three dimensions. As is true of Robusta, the silver skin 
adheres closely to the seed of G. canephora, but it is more uniformly 
brown in color than is the former. 
Latirentii. 
One tree of Goffea laurentii (S. P. I. No. 28080), which is culti- 
vated in the Congo Free State, Africa, and known also as G. robusta, 
grows at the station. (PL X, fig. 1.) It has not been observed to 
differ from the other Robusta coffees, and has fruited very heavily, 
often producing half an almud of cherries in a season. In one season 
it produced 19.4 liters (a little less than an almud) of cherries. 
Counts of three samples showed 581, 633, and 645 cherries per liter, 
respectively. 
Quillou. 
Goffea quillou was imported into Java from the French Congo 
by the Java Experiment Station, which later supplied the Porto 
Rico station with seed. Doctor Cramer 35 states that under favor- 
able circumstances G. quillou coffee produces more than other 
varieties, yielding in good years 2,500 pounds of merchantable coffee 
to the acre. 
Two plantings have been made at the Porto Rico station, the first 
of 47 trees from seed received and planted in October, 1914, and 
set in the field in September, 1915, and the second of 60 trees from 
seed planted in November and December, 1915, and set in the field 
in August, 1917. The development has been vigorous in good soil. 
The trees differ from those of Robusta in that they are more compact, 
* Coffees of the Dutch East Indies. Dr. P. J. S. Cramer. Tea and Coffee Trade Jour. 
i(l»18), TOd. 35, No. 5, ». 420. 
