During the autumn of 1828 Dr. Wollaston suffered from an affection of the brain, of which he died, December 22, 1828, retaining his faculties to the last. During the period of his illness, feeling that his life was precarious, he devoted himself to communicating, by dictation, his various discoveries and improvements to the world. Five papers by him were read during the last session of the Royal Society during that year, in one of which he alludes affectingly to his illness, as obliging him to commit his observations to writing more hastily than he was wont. Another is the Bakerian Lecture on the manufacture of platinum, already mentioned. Previous to his death he invested 1000_l._ stock in the name of the Royal Society, the interest of which he directed to be employed for the encouragement of experiments in Natural Philosophy. He was never married, and was Senior Fellow of Caius at his death. He was privately buried at Chiselhurst in Kent; of which parish his father had been rector. Dr. Wollaston’s philosophical character is thus described in the preface to a late edition of Dr. Henry’s ‘Elements of Experimental Chemistry:’—“Dr. Wollaston was endowed with bodily senses of extraordinary acuteness and accuracy, and with great vigour of understanding. Trained in the discipline of the exact sciences, he had acquired a powerful command over his attention, and had habituated himself to the most rigid correctness both of thought and language. He was sufficiently provided with the resources of the mathematics, to be enabled to pursue with success profound inquiries in mechanical and optical philosophy, the results of which enabled him to unfold the causes of phenomena not before understood, and to enrich the arts connected with those sciences by the invention of ingenious and valuable instruments. In chemistry he was distinguished by the extreme nicety and delicacy of his observations; by the quickness and precision with which he marked resemblances and discriminated differences; the sagacity with which he devised experiments and anticipated their results; and the skill with which he executed the analysis of fragments of new substances, often so minute as to be scarcely perceptible by ordinary eyes. He was remarkable, too, for the caution with which he advanced from facts to general conclusions: a caution which, if it sometimes prevented him from reaching at once to the most sublime truths, yet rendered every step of his ascent a secure station from which it was easy to rise to higher and more enlarged inductions. Thus these illustrious men, Wollaston and Davy, though differing essentially in their natural powers and acquired habits, and moving independently of each other, in different paths, contributed to accomplish the same great ends, the evolving new elements; the combining matter into new forms; the increase of human happiness by the improvement of the arts of civilized life; and the establishment of general laws that will serve to