On the other hand, his contributions to the general advance of the study were necessarily limited. By the time he became known to European scholars they had on their part advanced so far that only four letters of Niebuhr’s list remained for which a correct or approximate value had not been found. These were: 19 𐎮 _k_ of Lassen, 28 𐎩 _z_ of Jacquet, 32 𐎪 _g’_ of Lassen, 33 𐎸 _g_ of Lassen. The appearance of Rawlinson did not, therefore, take place till after the difficulty of the decipherment had been almost completely surmounted without his assistance. When his correspondence with Burnouf and Lassen began, in the autumn of 1838, he was, however, still in time to rectify two out of the four incorrect values. He found 32 (𐎪) in the name of Cambyses, where it occurs as the fourth sign, which he transliterated correctly as _j_; Kₐbujᵢy. Hincks afterwards read the sign _zh(i)_ and Oppert _z(j)i_; but both these sounds have since yielded to the one proposed by Rawlinson, and it now appears as _j_ before _i_. But Rawlinson’s most striking success was with the last letter, 33 (𐎸), another _g_ of Lassen. In his letter to Burnouf, he proposed to substitute _m_.[502] It is the initial letter in the name Lassen read ‘Gudrâha’ and thought indicated the Gordyaei. Rawlinson suggested the name was M’udraya, and should be compared with the Phoenician ‘Mŭdra’ and the Hebrew ‘Mitsraim,’ and signified, in fact, Egypt. Both of these emendations were, however, rejected by Lassen.[503] There is another sign which came under discussion at this time. It will be recollected that we have assigned 13 (𐎡) to Lassen, who gave it the approximate value of _t_. Rawlinson, however, suggested to Burnouf that its true value is not _t_ but _tr_. In this, however, he had been anticipated, as we have seen, by Grotefend in 1837, who suggested _thr_.[504] It is admitted that it is impossible to distinguish between the comparative merits of _tr_ and _thr_;[505] and as Rawlinson probably knew nothing of Grotefend’s ‘Beiträge’ at the time, he may be credited with having discerned the correct sound of the sign.[506]