The members of the Legislature shall receive for their services a compensation to be fixed by law and paid out of the public treasury, for not to exceed 60 days during any regular session of the Legislature and not to exceed 20 days during any special session; but no increase of such compensation shall take effect during the term for which the members of either house shall have been elected; Provided, that an appropriation may be made for the payment of such actual expenses as members of the Legislature may incur for postage, express charges, newspapers and stationery not exceeding the sum of Sixty dollars for any general or special session to each member; and Furthermore Provided, that the Speaker of the Assembly, and Lieutenant Governor, as President of the Senate, shall each, during the time of their actual attendance as such presiding officers receive an additional allowance of two dollars per diem.