while true do

-- Check for a block and make sure not a sapling
    turtle.select(1)
    if turtle.detect() and not turtle.compare() then
        turtle.select(2)
        turtle.dig()
        turtle.forward()

-- Chop the tree
        while turtle.digUp() do
            turtle.up()
        end

-- Done chopping, return to the bottom
        while not turtle.detectDown() do
            turtle.down()
        end

-- Move onto the first barrel, deposit wood
        turtle.back()
        for i = 2,16 do
        turtle.select(i)
            if (turtle.compare(1)) then
                turtle.drop()
            else
                turtle.dropDown()
            end
        end

-- Move onto the second barrel, deposit saplings
        turtle.back()
        for i = 2,16 do
        turtle.select(i)
            if (turtle.compare(1)) then
                turtle.dropDown()
            else
                turtle.forward()
            end

-- Place a sapling
        turtle.select(1)
        turtle.place()
    end

    else
        sleep(1)
    end
end