The Hebrew works of mediæval antiquity contain the germs of scientific discoveries which modern pride is pleased to designate as of comparatively recent origin. In the Zohar, a collection of treatises belonging to the Kabbala, are embodied highly philosophic cosmological ideas, and rational conceptions relating to the vital principle of Nature, and the scientific treatment of disease, which were subsequently applied to public instruction and practical use in the famous schools of Salerno and Montpellier. The various physiognomical changes wrought upon the lineaments of the human countenance by the cultivation of benevolent instincts or the indulgence of evil passions are there described with a faithfulness which points to an extraordinary insight into the incentives and desires which control the actions of men. In this remarkable compilation of Hebrew learning, the doctrine of Pantheism, as suggested by the time-honored philosophy of India, is set forth; the globular form of the earth, its diurnal revolution on its axis, the varying phases of that planet, the difference in the length of day and night at the equator and the poles, and the scientific reasons for the existence of these phenomena, are all described with an accuracy which is wonderful when the general ignorance of the epoch during which these opinions, so far in advance of the time, were promulgated, is remembered. In the thirteenth century, Jedediah-ben-Abraham, of Béziers, advanced the hypothesis that all objects impelled in opposite directions, and undisturbed by other forces, move in straight lines,--the essential element of one of the laws now universally recognized as governing the motions of the heavenly bodies. Solomon-ben-Virga, a Spanish refugee, in his historical treatise, Sebeth-Jehuda, published in the sixteenth century, states that the earth, equally attracted by the surrounding stars, remains suspended in the midst of space; an unmistakable conception of the principle of gravity which antedates its republication in Europe by more than a hundred years. The philosophical truths just enumerated, which anticipate the important discoveries of Boerhaave, Lavater, Galileo, Kepler, and Newton, afford a suggestive idea of the attainments of the rabbis, the accuracy of their reasoning, and the extent and profundity of their scientific knowledge.