It has been 150 years since D.I. Mendeleev formulated the Periodic law and expressed it visually in the form of a table of elements in 1869. As is clearly well known today, Mendeleev's ideas, confirmed by the discovery of the elements he predicted, turned out to be very promising indeed. However, Mendeleev was not the first, nor the only scientist to have investigated the periodic arrangement of the elements. With this in mind, the present paper seeks to highlight some of the other efforts made in the field during Mendeleev's lifetime. [For the full proceedings, see ED619611.]