48 INDEX. 
Page. 
Loess, of Red river 28 
of the Mississippi and the Rhine 28 
, Colonel G. A 27,31 
Lower Cross Timbers 27 
Lymnea z 28 
M. 
Map of the route, note on 42 
Marcy, Captain R. B 9, 10, 12, 32 
Marcou, Jules 17, 25, 26 
* Lieutenant 16 
Mesa 8 
Metamorphic rocks 12 
Mezquit timber 24 
Mineral waters 21,38 
Mines, of alabaster : 34 
of lea 36 
Mississippi, ancient alluvium of 28 
Moore, Dr., of Texas 32 
Mustang Springs 21 
N. 
Nova Scotia, gypsum 18, 26 
0. i 
Oak openings 24 
Ocoya creek, gypsum of 35 L| 
Ojo del Cuerbo 8,20,21 i 
Organ mountains 7,12 " 
trend of 2 T 
lead in the 36 
Origin of beds of gypsum 35 
€— 26 
Ostrea carinata ^: Sassi 39 
Owen, Dr. D. D 18 
Oyster shells, ledges of 40 
K 
Pecos river 9 
Permian 25 
Phengites : 
Physical geography, remarks on e 7 
Physa 28 
Plains between the Rio Grande and the Guadaluy tai 19 
Plaister 26, 34 
gypsum of 18 
Plaster of Paris 33 
P i 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 
_Productus 26, 27, 32, 40 
Pupa 28 
R. 
| Reservoirs of water in the deserts | 15 
