Nelly and Jessie purchase several hundreds acres of farmland as tenants in common. Nelly remains in the city and conducts her law practice while Jessie moves onto the land, cultivates it, and produces a crop that he sells. Is Nelly entitled to a share of the proceeds? Is Nelly entitled to one-half the fair rental value of the farm? What if Jessie rented the land to Vanessa, who farmed it and paid $100 rent to Jessie? Can Jack obtain a contribution from Nelly for his costs in improving and enlarging various businesses on the property?