Mich. Comp. Laws § 458.156: Donations; use.

Sec. 6.

All money or property given to the corporation, for any 1 of the objects specified in the last preceding section, to be designated by the donor, shall be used by the corporation for that object and no other; and all moneys or property given to the corporation generally, and without the donors specifying the particular object to which it shall be applied, may be used to promote any 1 or more of the objects named in said section.