‘KINDS OF SOILS. 149° 
made of sheet metal, capable of holding something more 
than 9 liters of water, and furnished at 6 with a stop-cock. 
By means of a tube of rubber it is joined to the series of 
Fig. 8. 
vessels, 1, 2, 3, and 4, which are connected to each other, 
as shown in the figure, the recurved neck of 2 fitting 
water-tight into the nozzle of 1 at a, ete. 
These vessels are made of glass, 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 0 and ¢ is 2 feet. The cock, 4, is 
opened, so that in 20 minutes exactly 9 liters of water 
