Report of first expedition to South America, 1913 . Fig. 2. — Type of Vegetation covering the higher slopes ofthe Canon along the Trail from Surco to — Oroya Fever limuGE is the XVIII. —Peru. GEOGRAPHICAL DISTRIBUTION 59 Trees are almost entirely absent, although a very few scatteredspecimens may be seen here and there far up the slopes. Coldmountain streams run through these valleys, the soil of whichis formed particularly of clay which is covered with luxuriantvegetation in strong contrast to that on the slopes. Odrio-zola has given a most interesti
Report of first expedition to South America, 1913 . Fig. 2. — Type of Vegetation covering the higher slopes ofthe Canon along the Trail from Surco to — Oroya Fever limuGE is the XVIII. —Peru. GEOGRAPHICAL DISTRIBUTION 59 Trees are almost entirely absent, although a very few scatteredspecimens may be seen here and there far up the slopes. Coldmountain streams run through these valleys, the soil of whichis formed particularly of clay which is covered with luxuriantvegetation in strong contrast to that on the slopes. Odrio-zola has given a most interesting account of the flora in theseregions. The vegetation, however, is abundant only in thevicinity of the streams or rivers, or where irrigation ditcheshave been constructed, since, as intimated, practically verylittle rain falls in these regions the greater part of the and there, water is drawn from the rivers by means ofsluiceways and carried some distance down the valley whereit is used to irrigate the fields that occupy the nearly levelvalley between the steeply rising mountains on each side. Asthe rivers descend rapidly over numerous ca
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