[3] It is interesting to remember that Captain von Papen had in the earlier part of the year, while he was still in Mexico, conducted an investigation into the types of explosives used in Mexico for similar enterprises. This investigation had been undertaken at the request of the German Ministry of War. Letters regarding this matter were found in Captain von Papen’s effects by the British authorities, and are printed in the British White Papers, Miscellaneous No. 6 (1916). [4] Fritzen, who was captured in Hartwood, Cal., on March 9, 1917, was arraigned in New York City on March 16, and after pleading not guilty, later reversed his plea. He is at present serving a term of eighteen months in a Federal prison.