EXPLANATION OF THE ILLUSTRATION 
Prare XXXVII. Mule trail up the Ramospata ridge 
out of the Sandia Valley (Dept. of Puno) Peru. In 
the thickets in the foreground Cinchona carabayen- 
sis Weddell was rediscovered. 
Photograph by W. H. Hover 
[ 146 ] 
