The following remarks, for which I am indebted to the kindness of the able chemist and naturalist mentioned above, will be highly valued, both by those who are interested in the many curious physiological questions involved in the association of the most obscure forms of vegetable life with the remarkable phenomena of mineral springs; or in the exquisitely beautiful microscopic structure of the lower Algae, which has thrown so much light upon a branch of natural history, whose domain, like that of astronomy, lies to a great extent beyond the reach of the unassisted eye.--J.D.H. 1. Mineral water, Soorujkoond, Behar (vol. i., chap. ii), contains chloride of sodium and sulphate of soda. 2. Mineral water, hot springs, Yeumtong, altitude 11,730 feet (see vol. ii., chap. xxii). Disengages sulphuretted hydrogen when fresh.--This water was inodorous when the bottle was opened. The saline matter in solution was considerably less than in the Soorujkoond water, but like that consisted of chloride of sodium and sulphate of soda. Its alkaline character suggests the probability of its containing carbonate of soda, but none was detected. The rocks decomposed by the waters of the spring consist of granite impregnated with sulphate of alumina. It appears that in this case the sulphurous waters of Yeumtong became impregnated in the air with sulphuric acid, which decomposed the felspar,* [I have, in my journal, particularly alluded to the garnets (an aluminous mineral) being thus entirely decomposed.-J.D.H.] and united with its alumina. I found traces only of potash in the salt. Sulphuretted hydrogen waters appear to give origin to sulphuric acid, when the water impregnated with the gas reaches the surface; and I have fine fibrous specimens of sulphate of lime accompanied with sulphur, from the hot springs of Pugha in west Tibet, brought by Dr. T. Thomson. 3. Mineral water, Momay hot springs, (vol. ii., chap. xxii).--When the bottle was uncorked, a strong smell of sulphuretted hydrogen was perceived. The water contains about twenty-five grains per imp. gallon, of chloride of sodium, sulphate and carbonate of soda; the reaction being strongly alkaline when the solution was concentrated. 4. Effloresced earth from Behar (vol. i., chap. i), consists of granite sand, mixed with sesquicarbonate of soda. _On the Indian Algae which occur principally in different parts of the Himalayan Range, in the hot-sprinys of Soorujkoond in Bengal, Pugha in Tibet, and Momay in Sikkim; and on the Fungi of the Himalayas. By the Rev. M. J. Berkeley, M.A.