Others in the 1860s suggested that elements group together. For example, John Newlands, published his Law of Octaves in 1865. The lack of spaces for undiscovered elements and the placing of two elements in one box were criticized and his ideas were not accepted. Another was Lothar Meyer, who published a work in 1864, describing 28 elements. Neither attempted to predict new elements. In 1863 there were 56 known elements with a new element being discovered at a rate of approximately one each year.