Th: Jefferson presents his friendly salutations to Doctr. Barton: when sending him the dried specimens of plants from mr Dunbar he omitted to send some moss which he had taken out of the hotsprings of the Washeta, in a temperature of 150.° in which he says are some of the animalculae, inhabitants of the moss. Th:J. having no microscope here has been unable to see them: but he commits them now to the better hands of Doctr. Barton.