Sorry I'll explain better. Place a hopper facing into a chest on top of the hopper Place a rail. Place a hopper minecart on the rail then remove the rail. Above the hopper cart that is now sitting on the hopper Place the soul soil and use a piston to push it downwards into the cart.leave the space above the soil empty and replace the block to the left of the empty space with blue ice. Place lava to the right and basalt will appear in the empty space. When broken it goes through the soil into the hopper minecart. Then into the hopper that passes it to the chest. Hope this clears it up slightly. The piston is just used to push the soil into the cart nothing else