to fall into error;  to fall into difficulties

I fear I shall soon be under the necessity, however disagreeable it may be to me, of drawing bills to raise Cash for some of the negrohouse materials—a large share of the cost of them I hope however to get credit for till the beginning of 1834 when wwe shall have sugar to make.

So where '2' quus '2' equals “4”, and “4” quus '2' equals “6”, “68' quus '57' equals “5”.

Some will never do it even if you ghost write it for them.