. 15,9 Reinking and Groff: Siamese Seedless Pummelo 401 
ally salty. In order to obtain an accurate idea of the salt 
content of the water, samples were collected. The water was 
collected in June, and the analyses were made in August. The 
mineral constituent such as calcium may have separated out 
during the interval, but from a sodium chloride standpoint the 
contents, after long standing, should not have altered. Sample 
1 was collected on June 7, 1920, at Ban Mai, Sarm Prarm, 
Nakorn Chaisri, from a ditch located in the center of the seed- 
less-pummelo orchard under investigation. The sample was 
taken when Tachin River was at high tide. Sample 2 was 
collected on June 7, 1920, in the same section, but from the 
canal leading from Tachin River, at the intake into the orchard, 
about 300 meters from Tachin River. The sample was taken at 
high tide. Sample 3 was taken on June 8, 1920, in the same sec- 
tion, but from Tachin River at the entrance of the canal leading 
to the orchard. This sample also was taken at high tide. The 
results of the analyses are given in Table 10. The official method 
for the determination of the chlorine was used, and the total 
chlorides were computed as sodium chloride. The values given 
are averages of triplicate determinations. 
TABLE 10.—Analyses of water used for irrigation of pummelo orchards 
at Ban Mai, Nakorn Chaisri, Siam." 
Sam- Total Sodium ; 
ah Date. chlorine. | chloride. Location. 
Parts per 
million. | Per cent. 
1} June 7, 1920.. sukees cence men ees 11, 820 1.95 | Within orchard. 
2 Gu RS A Re ee 12, 802 2.11 | Canal leading to orchard. 
oS} June 8) on a as 12, 230 2.01 | Tachin River. 
8 Determinations by Miss H. Kenward, of the department of chemistry, College of Agricul- 
ture, Los Bafios. 
As shown by Table 10 the water used for irrigation was ex- 
tremely salty on June 7 and 8, 1920. The average sea water 
has approximately 3.5 per cent of solids in solution. Of this 
amount 2.7 per cent is reported as sodium chloride. The water 
in Tachin River at high tide at Ban Mai, Nakorn Chaisri, ap- 
proaches sea water in salt content. The analyses of the three 
samples taken at different points agree very closely. 
In order to get a comparison of the water used for irrigation 
in other pummelo sections of Siam, a sample was taken from the 
Menam Chao Phaya at Bang Bakok, near Bangkok. The Bang 
Bakok section is famous for its production of, chiefly, the Kao 
