402 The Philippine Journal of Science 1921 
Phuang variety of pummelo, but other varieties of Kao pum- 
melos are also grown. The Nakorn Chaisri seedless, or Kao 
Pan, variety when grown at Bang Bakok does not produce 
fruits of the excellent flavor of those grown in Ban Mai, on 
Tachin River. The seedy character of the fruits is also re- 
ported to be greater when grown at Bang Bakok. The water at 
Bang Bakok was said to be salty from about February to May, 
depending upon seasonal conditions. Usually the water becomes 
fresh in June when the rains begin. A sample of water taken on 
June 14, 1920, from Menam Chao Phaya River, at Bang Bakok, at 
the entrance of a canal leading to a Kao Phuang orchard was used 
for analysis. The sample was taken at medium tide. The 
same method for analysis was used as that described for Tachin 
River water. The total chlorine was 283 parts per million, and 
the sodium chloride, 0.04 per cent. 
The water, as shown by the analysis, used for irrigation of 
the Kao Phuang orchards at Bang Bakok, in June, contained 
only an amount of salt normal for river water. 
The results obtained show that there is a great difference 
in the salt content of water used for irrigation, at least during 
the first part of June, in the two sections. This would indicate 
that the salt content of the two rivers is different throughout the 
year and that the salt has some influence on the quality and pos- 
sibly the seediness of the fruits. Ban Mai is situated on Tachin 
River about 40 kilometers from the Gulf of Siam. The people 
reported that they can drink the river water for only six 
months of the year, as it is salty from January to June. At 
Tachin, which is 5 to 6 kilometers from the gulf, the people can 
drink the water for only about two months of the year. Sixty 
kilometers up the river from the gulf the people report that they 
drink the water for eight or nine months. These reports would 
indicate that the river is salty for at least six months of the 
year at Ban Mai ; and, according to the analysis, it is extremely 
salty even during June, when it is supposed to begin to freshen. 
A further study of the salty nature of the water should be 
conducted to determine the exact time throughout the year dur- 
ing which the water contains salt. Such a study should be 
made of both regions ; one at Ban Mai, on Tachin River, and the 
other at Bang Bakok, on the Menam Chao Phaya. In this way 
a comparison could be made of the salt content of irrigation 
water used in a section that produces a seedless fruit of excellent 
quality with that of the water used in a section that produces 
the same kind of fruit, but of a somewhat inferior quality. Be- 
