To the late Miss Rolleston, however, belongs the honour of collect-ing a mass of information bearing on this subject; but, published as it was, chiefly in the form of notes, unarranged and unindexed, it was suited only for, but was most valuable to, the student. She it was who performed the drudgery of collecting the facts presented by Albumazer, the Arab astronomer to the Caliphs of Grenada, 850 a.d.; and the Tables drawn up by Ulugh Beigh, the Tartar prince and astronomer, about 1450 a.d., who gives the Arabian Astronomy as it had come down from the earliest times. Modern astronomers have...