INDEX 
Page. 
Loess, of Eed river_-__.___ 28 
of the Mississippi and the Rhine___ 28 
Loomis, Colonel G. A __.____ 27 31 
Lower Cross Timbers _*_....__ 27 
I/ymnea . 28 
M. 
Map of the route, note on..__. 42 
Marcy, Captain R. B ...9,10,12, 32 
Marcou, Jules ....... 17 25, 26 
Marshall, Lieutenant _____ 46 
Mesa _ g 
Metamorphic rocks ...... 42 
Mezquit timber _ 24 
Mineral waters . 21, 38 
Mines, of alabaster..... 34 
of lead............ 30 
Mississippi, ancient alluvium of. 28 
Moore, Dr., of Texas..... 32 
Mustang Springs _ 21 
N. 
Nova Scotia, gypsum........... 18,26 
O . 
Oak openings ______ ■ 24 
• Ocoya creek, gypsum of_ 35 
Ojo dd Cuerho . 8, 20, 21 
Organ mountains ________ 7,12 
trend of. 7 
lead in the............ 36 
Origin of beds of gypsum...... 35 
Orthoceras.. ......... 26 
Ostrea carinata __ 39 
Owen, Dr. D. D _ 18 
Oyster shells, ledges of......... 40 
P. 
Pecos river ______ 9 
Permian _ 25 
Phengites _ 34 
Physical geography, remarks on_ 7 
Physa .-..... 28 
Plains between the Rio Grande and the Guadalupe mountains_ 19 
Plaister Cove, N. S . 26, 34 
gypsum of. 18 
Planorbis.. - 28 
Plaster of Paris - 33 
Pleurotomaria _ 32 
Polished rocks, at the Hueco Tanks..-. 14 
on the Colorado Desert_ 14 
Pope, Captain, quoted—. 18,19,24 
Preston -------- 25, 28 
Preston Salt Valley, Virginia, gypsum--------.. 18 
Productus .....j. 26, 27, 32,40 
Pupa _ 28 
R. 
Redriver .......-. 9 
Reservoirs of water in the deserts.......... 15 
