1883.] The Naturalist Brazilian Expedition. 1007 
the human stem species that have aborted some parts, as for ex- 
ample, some of the digits of the foot, or the hindermost molars. 
Such species will be nearer completion and less capable of further 
advance ; their mental growth as well as their bodily develop- 
ment will be to some extent arrested by the abortion of the parts. 
If, on the other hand, a portion of the descendants of existing 
humanity acquire the power of using their feet to perform one 
set of delicate offices in obedience to the orders of the brain 
while the hands perform another set, and of using right or left 
limbs equally well, a vast increase of mental power will be the 
concomitant of such an acquisition. In many other directions 
there are possibilities, the eye may gain a power of adjustment 
that will convert it into microscope and telescope, the ear become 
ably to close itself at will as is the eye, the touch become far finer 
than it is now in those most sensitive. 
Certain it is, at any rate, that a wide range of physical capa- 
bilities is essential to high mental development. The Houhyn- 
hym reads well in Gulliver's Travels, but an animal whose limbs 
are degraded to a line of levers can never advance mentally. 
Mind is an animal characteristic, and a classification of animals 
which leaves it out is a one-sided classification. 
:0:— 
THE NATURALIST BRAZILIAN EXPEDITION. 
BY HERBERT H. SMITH. 
SECOND PAPER.—THE LOWER JACUHY AND SÃO JERONYMO. 
( Continued from page 716.) 
I WILL now describe the main geological features of the São 
Jeronymo district, which I studied carefully during several 
weeks, traversing all parts of it on foot or on horseback. My 
observations here extended over a space about forty miles long 
and twenty broad, comprehending the country south of the Ja- 
cuhy to the Serra do Herval, between the Arroio da Porteirinha 
on the west and the Arroio dos Ratos and Arroio da Divisa on 
the east. 
T have stated that the hills generally trend east and west. 
Traveling southward from the Jacuhy, about forty miles, five 
Main ridges are passed, each of which is successively higher than 
the preceding. The first, at its highest point, is about 600 feet 
