Any number of persons, not less than four hundred, residing in this state, who collectively own not less than twenty thousand acres of growing grain, in this state, which they desire to insure against loss or damage by hail, and who shall actually subscribe for such insurance to the amount of two hundred thousand dollars, in not less than four hundred separate risks, located in not less than ten counties, and upon not more than five risks of one hundred sixty acres each in any one township, may form an incorporated company for the purpose of mutually insuring growing grain against loss or damage by hail: Provided, That each subscriber shall have paid a membership fee of five dollars, for which duplicate receipts have been executed conditioned for the return thereof at the end of one year from date of first subscription if the company has not then completed its organization, the original receipt to be delivered to the member subscribing, and the duplicate receipt, together with the fee, shall within thirty days after the execution thereof be deposited with the commissioner of insurance, until a certificate of authority to transact business has been granted by the commissioner of insurance, if granted within one year from date of first subscription, otherwise to be returned to the subscribing member.