The Philippine 
Journal of Science 
VOL. 19 OCTOBER, 1921 No. 4 
THE KAO PAN SEEDLESS SIAMESE PUMMELO AND ITS 
CULTURE 
By 0. A. Reinking 1 and G. W. Groff 1 2 
SIXTEEN PLATES AND ONE TEXT FIGURE 
Siam has long been noted for its production of delicious pum- 
melos. These fruits find their way to many of the larger port 
cities of Asia, where they can often be purchased in open 
markets under the name of Bangkok or Siam pummelos. Many 
varieties are produced both for home consumption and for ex- 
port. Residents of Bangkok and other parts of Siam refer 
to the so-called seedless Nakorn Chaisri or Kao Pan pummelo as 
the best. 
Of late years the Kao Pan seedless pummelo, from Nakorn 
Chaisri, has created a good deal of interest in the United States, 
due primarily to the investigations and enthusiasm of Mr. Walter 
T. Swingle, of the Division of Crop Physiology and Breeding 
Investigations of the Bureau of Plant Industry, Washington, 
D. C. During the past eight years attempts have been made 
to introduce this form and other Siamese pummelos into the 
United States and the Philippines. Until the present investi- 
gation, however, no successful introduction of the true seedless 
form seems to have been made or, if made, the trees upon 
1 Professor of plant pathology and plant pathologist of the College of 
Agriculture and Agricultural Experiment Station, Los Banos, Laguna, 
Philippine Islands; and collaborator, Crop Physiology and Breeding In- 
vestigations, United States Department of Agriculture, Washington, D. C. 
2 Professor of horticulture and director of agricultural work, Canton 
Christian College, Canton, China, and field assistant, Crop Physiology and 
Breeding Investigations, United States Department of Agriculture, Wash- 
ington, D. C. 
181287 389 
