December 7, 1926 - Today we visited the Graveyard mine, from which one of my boys brought me bats last spring. The Graveyard mine about a mile and a half north of Divisadero. It is a small T shaped tunnel which is located about 50 feet south of the south side of the cemetery. It is on the west side of the trail and about 40 feet back in the colon brush where it leads back under a steep hill. The mouth of the tunnel was caved in. By lying down on our stomachs we were able to slide through the narrow entrance. As I poked my head in I saw several small bats (probably Micronycteris) fly from near the entrance back toward the face of the tunnel. It was about 30 feet back to where the two lateral tunnels branched off at right angles to form the T. These tunnels were about 3 feet long. We blocked the superior opening with a mosquito net and and proceeded with flash-