KINDS OP SOILS. 



149 



made of sheet metal, capable of holding something more 

 than 9 liters of water, and furnished at h with a stop-cock. 

 By means of a tube of rubber it is joined to the series of 



vessels, 1, 2, 3, and 4, which are connected to each ether, 

 as shown in the figure, the recurved neck of 2 fitting 

 ^water-tight into the nozzle of 1 at a, etc. 



These vessels are made of ghiss, and together hold 4 

 liters of water; their relative volume is nearly 



1 :.8: 27: 64, or = 1= : 2=* : 3= : 4\ 



5 is a glass vessel of somewhat more than 5 liters, 

 capacity. 



The distance between h and r is 2 feet. The cock, 5, is 

 opened, so that in 20 minutes exactly 9 liters of water 



