To meet the expenses incurred under the provisions of sections 40:37-195 to 40:37-247 of this title, in addition to the money received from benefit assessments as herein provided and otherwise, the board of chosen freeholders of the county shall from time to time, on the requisition of the park commissioners, borrow money in the name and on the credit of the county by issuing bonds of the county to a sum in the aggregate not exceeding two million dollars. All such bonds shall be issued as hereinafter in section 40:37-235 of this title provided.