Letter kept secret by L. E. Froom

"Elder Froom has some important secret letters in his files. Dr. J. H. Kellogg was a close family friend. He became mixed up in Pantheism. He tried to persuade Dr. Waggoner. The Lord warned the Doctor through Sister White. He heeded the warning. I will tell you about it and about a personal letter in the files of L. E. Froom. 

Now Dr. Waggoner wrote a letter to Dr. Kellogg, trying to persuade him against Pantheism, but Dr. Kellogg would not listen. It is this letter that Elder Froom has."

Ellis P. Howard, Son-in-law of Ellet J. Waggoner to the General Conference of Seventh-day Adventists.  The letter still goes unanswered.