288 



GENERAL SCIENCE 



up and in a state of suspension in the water. Allow the mixture to 

 settle for five minutes and then pour the roily water into another 

 bottle, leaving the particles which have already settled in the first 

 bottle. After five more minutes again pour off the roily water. Do 

 this five times, leaving the water in the last bottle until all the 

 particles have settled, when the clear water may be poured off. 



medium fine 

 sand sand 



4.5 % 40 % 



FIG. ,249. 



Compare the size of the particles in the different bottles. As many 

 divisions as desired may be made in this way. Figure 249 shows 

 the composition of sandy loam, which is an excellent soil. 



Table Showing Mechanical Analysis of Soils. - 



Names of Soils. Clay soils are those which contain a 

 large proportion of the smallest particles, while those that 

 contain a large proportion of sand are simply called 

 sandy soils or sands. Loams are intermediate mixtures 

 of sand and fine particles. 



