sw priverpics UL piavety, wich would Nd the greatest counter- 
action from the gravity of the plant, when the stem was in a hori- 
zontal position, 
The effect here described may be produced by a buoyant prin- 
ciple bearing up the plant in which it is inclosed, as the hydrogen 
gas bears and presses upward the body of a balloon; or, by drawing 
it upwards, in consequence of its adhesion, as the balloon, rendered 
buoyant by the gas, carries up the car which is attached to it. Ln 
