198 
Report on the Practice of Ensilage, 
pressure. The hydraulic jack is then worked by one man or very easily by 
two, and, having a stroke of about 6 feet, quickly raises the weighted lever ; 
the pin in the cradle is withdrawn, and put in so many holes higher (see 
Fig. 4. — Section of Mr. Johnson's new Silo. 
Fig. 6), say 2 feet. On comes the jiressure again ; and this time, the grass 
having become so far solidified as to be able to bear the weight, the beam is 
kept up at, say, half stroke, and there hangs the weighted lever, preserving 
