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Harvey demonstrated the circulation of the blood. Asellius proved the use of the lacteals. Pecquet traced the thoracic duct. Rudbeck, Bartholin, Nuck, Dr. Richard Hale, and others, observed parts of the lymphatic system. The art of injecting the vessels was invented; the microscope was applied to anatomical uses; and Chemistry unveiled countless objects of research, in every department of natural history. Science is like an alpine region, where the attainment of one eminence is sure to bring others into view, though the summit may be still veiled by impenetrable clouds, or cut off by untraversable chasms. The true philosopher exults in the sublimity of the extending prospect, and feels doubly
