Handwritten letter from N.D. Pendleton to Bishop William F. Pendleton. “Dear Brother, I find that I have the “Posthumous Tracts.” Have read them with great pleasure. Certainly the “Animal Spirits” of the P.T. is not identical with the Spirituous Fluid of the “Economy.” The one appears to be manufactured in the Cortical gland, the other in the Simple Cortex or fibers which construct the gland(?). From a comparison of the teachings it strikes me that the Animal Spirits is a volume of the white or middle blood vivified by an influx of the spirituous fluid. However the term seems to be used in several different senses. Dandridge.”