Samuel Lockwood, Popular Science Monthly (1873)
“ This heap or mass of net-work, commonly called a sponge, is really the skeleton of the sponge. When living it is covered with, or literally embedded in, a glairy, gelatinous, or albuminous substance. But this is so unlike ordinary animal tissue—for it seems, really, tissue-less—that it has received the technical name sarcode. This sarcode fills the meshes above mentioned; and is held in place by innumerable tiny spicules, mixed in, so to speak, like the hair in the mortar of the plasterer. ”
