Section 2. Section seven of the same Act, as amended by Commonwealth Act Numbered One hundred seventy-eight, is hereby further amended to read as follows:

"Sec. 7. Freedom to contract. — The landlord and tenant shall be free to enter into any or all kinds of tenancy contract as long as they are not contrary to existing laws, morals and public policy. Such contract shall be conclusive evidence of what has been agreed upon between the contracting parties, except in case of fraud or error, if the said contract is not denounced or impugned within thirty days from its registration in the office of the municipal treasurer, as provided in section five of this Act.

"The following stipulations are hereby declared to be against public policy:

"(a) If the tenant shall receive less than fifty-five per cent of the net produce, in case he furnishes the work animals and the farm implements, and the expenses of planting and cultivation are borne equally by said tenant and the landlord.

"(b) If the rental stipulated to be paid by the tenant to the landlord is higher than twenty-five per cent of the estimated normal harvest, in case of a contract providing for a fixed rental of the land.

"(c) If the landlord is the owner of the work animal, and the tenant of the farm implements, and the expenses are equally divided between the landlord and the tenant, for the tenant to receive less than fifty per centum of the net crop."