CONTENTS. 
CHAPTER X. 
Page. 
I. Geological report of the country explored under the 38 th and 41 st parallels of north latitude in 1858-54, 
by James Schiel , M. D., geologist for the expeditions - -- -- -- -- gg 
II. Letter from Professor J, W. Dailey , upon infusorial fossils submitted to him by Dr. Schiel - - 111 
APPENDIX. 
Instructions from the Secretary of War - - - - - - - - - 113 
ERRATA. 
Page 77.—Under the head of Corrected Barometer, No. 551, observation of December 12, at 12 o’clock m., for 25.713, read 
25.613. 
Page 77.—Under the head of Corrected Barometer, No. 496, observation of December 12, at 3 p. m.,for 25.768, read 25.668. 
Page 80.—Under the head of Corrected Barometer, No. 551, observation of February 21, at 9 a. m., for 25.698, read 25.598. 
Page 80.—Under the head of Corrected Barometer, No. 551, observation of March 3, at 9 a. m., for 25.758, read 25. 658. 
Page 87.—Under the head of Corrected Barometer, No. 551, observation of May 8, at sundown, for 25.758, read 25.658. 
