At a recent meeting of the Delaware Co. Institute of Science, Colonel Willcox spoke of having been in a mill not many miles distant, where cocoanut shells were being ground in large quantities. He ascertained that the powder was in demand for the adulteration of pepper, and probably other spices. Dr. Smith said that years ago he had seen the preparation of potatoes, which he believes was for a similar purpose. They were dried, browned and ground. John Benington said that when a boy in a grocery store in England, a powder was in common use for such purposes. It was called "peedee," but he did not know what it was made of. Probably it was the powder of post which used to be spoken of.