Donations, deposits or bequests may be made in trust by mutual agreement between the cemetery and lot owner or lot owners, for the special care of specified lots, monuments or mausoleums in any such cemetery, and such funds shall be invested in like manner as the Perpetual Care Fund, but a separate account shall be kept of each amount so deposited, donated and bequeathed and only the income derived from such funds shall be used in the care, maintenance and repair of such lots, monuments and mausoleums, unless otherwise provided by the donor.