Section 41. The state treasurer shall have the custody and keep a separate account of all notes, bonds and mortgages belonging to the commonwealth, and shall receive all money accruing therefrom. All deeds and instruments conveying real estate to the commonwealth shall, when recorded, be deposited with and safely kept by the state treasurer. Such records shall not include those pertaining to real property acquired for the use of state agencies, under sections 32, 33 and 39 of chapter 7C.