12 
BULLETIN 62, HAWAII EXPERIMENT STATION 
The degree of agreement of this method of mechanical soil analy- 
sis with that of the pipette method is given elsewhere in this bulletin 
(p. 37). It may. be stated here that the agreement has been fairly 
good, especially with heavy soils, and for this reason the rapid 
hydrometer method appears to be adapted to Hawaii soils, espe- 
cially for routine determinations. Dennett (16, p. 375) and Steele 
(34, p. 31) found the same to be true with heavy soils of other 
countries. 
Of the 78 soils examined for textural characteristics, 49 were 
found to be clay (2 sandy clay), 22 clay loam (15 sandy clay loam), 
5 sandy loam, and 2 silt loam. 
In the figures given in the Appendix, the limits in the diameter 
range for the different grades of particles do not correspond to 
so so 
Figure 6. 
-Diagram showing the distribution of 71 Hawaii soils into the principal 
soil classes on the basis of mechanical analysis 
those used in the United States Department of Agriculture Bureau 
of Chemistry and Soils (sand particles from 2 to 0.05 millimeters 
in diameter, the silt particles from 0.05 to 0.005 millimeters, and 
the clay particles less than 0.005 millimeter in diameter), but the 
different textural subdivisions are taken in the meaning of Bouyou- 
cos (5, p. 320; 6, p. 234; 7, p. 475) . He states that the rapid hydrom- 
eter method includes a part of the fine silt fractions in the clay or 
colloid fraction and that a part of the silt fraction is included in 
the fine sand. 
The soil classes obtained by the rapid hydrometer method were 
checked in the case of 21 soils with the method of repeated sampling 
at a certain depth in order to obtain a comparison. The soil classifi- 
cation obtained was the same by both methods for 14 of the 21 soils. 
In the other 7 slightly different classification was obtained due to 
