he high lands of Mexico, the districts which at
least three different races have chosen to settle in, neglecting the
fertile country below. A sharp turn in the road brings its fairly out
into the plain; and then on our left are the two snowy mountains that
lie at the edge of the valley of Mexico, Popocatepetl and Iztaccihuatl,
famous in all Mexican books. Like Orizaba of yesterday, they seem to
rise from the plain close to us; and from the valley between them there
pours down upon us such a flood of icy wind, that, though windows are
pulled up and great-coats buttoned round our throats, we shiver
piteously, and our teeth fairly chatter till we get out of the river of
cold air; and then comes hot sunshine and dust again.

Anxious to make sure that we have really got into the land of Aztec
civilization, Mr. Christy gets down from the diligence, and hunting
about for a few minutes by the road-side, returns in triumph with a
broken arrowhead of obsidian. A deep channel cut by a water-course
gives us our first idea of the depth of the soil; for these plateaus
were once nothing but deep hollows among the mountains, which rain and
melted snow, bringing down fragments of porphyry and basalt--partly in
their original state and partly decomposed--have filled up and formed
into plains. Signs of volcanic action are abundant. To say nothing of
the two great mountains we have just left behind, there is a hill of
red volcanic tufa just beyond us; and still further on, though this is
anticipating, our road passes over the lava-field at the foot of the
little volcano of Santa Barbara.

There is a population here at any rate, village after village; and
between them are great plantations of maize and aloes; for this is the
district where the best pulque in Mexico is made, the "llanos de Apam."
It is the _Agave Americana_, the same aloe that is so common in
southern Europe, where indeed it flowers, and that grows in our gardens
and used to have the reputation of flowering once in a hundred years. I
do not exaggerate when I say that we saw hundreds of thousands of them
that day, planted in long regular lines. Among them were walking the
Indian "tlachiqueros," each with his pigskin on his back, and his long
calabash in his hand, milking such plants as were in season.

[Illustration: INDIAN TLACHIQUERO, COLLECTING JUICE OF THE AGAVE FOR
PULQUE.]

The fine buildings of the haciendas, and more especially the churches,
contrast strongly with