PRACTICE XXXIII (CONTINUED) 



When the microscope reveals that no compound granules re- 

 main, the samples are ready for separation into the different 

 grades. Transfer soil and water from shaker bottles to two- 

 quart milk bottles.. Remove stoppers from the shaker bottles and 



S. * 



FIG. 9. BOTTLE FOR MECHANICAL ANALYSIS 

 A, tube for compressed-air connection; B, delivery tube 



wash them off carefully with distilled water so as to save all of 

 the adhering particles. Make an apparatus similar to that shown 

 in the figure, using an inverted two-hole rubber stopper so large 

 that it will close the mouth of the bottle without going in. 



67 



