Klug has collected data of great interest relative to the 
different ‘‘kinds’’ of yoco. His five collections from Um- 
bria are annotated with different names which would sug- 
gest that the Inga Indians of the region regard them as 
different. Klug’s notes unfortunately do not explain the 
nature of these differences nor why the Indians have these 
distinct names. A careful examination of Klug’s speci- 
mens fails to reveal a single botanical character which 
would suggest that any other species or variety is repre- 
sented; all of his collections are referable to Paullinia 
Yoco. The several common names annotated by Klug 
are as follows: blanco yoco; huarmy yoco; tarueca yoco; 
yagé yoco; canangucha yoco; verde yoco. No mention is 
made of yoco colorado. ‘Two of these names suggest that 
yoco may be used in connection with other plants. The 
name yagé yoco might mean that Paullinia Yoco is used 
together with the narcotic yajé (Banisteriopsis inebrians 
Morton and other species). Canangucha yoco might sug- 
gest that Paullinia Yoco is taken with chicha de canan- 
guche, an alcoholic drink prepared from the fruits of 
Mauritia minor Burrett. All of my data, however, as 
well as those which others have published, indicate that 
yoco is always used alone. 
III. The chemistry of yoco 
A number of sections of stem (totalling some ninety- 
six pounds) of the type plant (Schultes 4028) were col- 
lected and have been submitted to Dr. Barriga- Villalba 
of the Laboratorios Samper-Martinez, Bogota, for phy- 
tochemical examination. The results will be published 
in an early number of Ca/dasia. This analysis will be in- 
teresting because former chemical studies of yoco were 
undertaken with material the exact identity of which is 
as yet not known. 
In 1926, Rouhier and Perrot (** Le ‘yocco,” nouvelle 
[ B12 ] 
