19. Share of profits as interest on loan.

The advance of money by way of loan to a person engaged or about to engage in any business on a contract with that person that the lender is to receive a rate of interest varying with the profits, or is to receive a share of the profits arising from carrying on the business, does not of itself make the lender a partner with the person or persons carrying on the business or liable as such, provided that the contract is in writing and signed by or on behalf of all the parties to it1. It is immaterial whether