On a Substance Presenting the Chemical Reaction of Cellulose, Found in the Brain and Spinal Cord of Man *By Rudolph Virchow. (Sept. 4, 1853.) Virchow's Archiv. B. VI. H. 1. p. 135.

It is well known that Carl Schmidtf was tlie first to discover in tlie Ascidian the presence of a principle previously known to exist only in plants, viz. cellulose, and to show that it was a constituent of the animal tissue. The researches of Kolliker and Lowig, j of Scliacht,? and of Huxley || have established this important fact. The occurrence of this substance, however, was limited to a comparatively very low class of the Invertcbrata; and the further discovery made by Gottlieb, in Euglena viridis, viz., that this infusorium contains par amyIon, a body isomerous with starch, also had reference only to a creature in the lowest class of the animal kingdom.^]" Nothing of the kind, on the other hand, lias been known as existing in the vertebrata, and it is only since the discovery by C. Bernard?that the liver produces sugar?that we have had reason to