Studies in American Orchids IV 
By Lesuizg A. Garay ........ . . . 186 
Two Additions to the Orchid Flora of Venezuela 
By CHarLes SCHWEINFURTH .. . . . . . . 219 
A Little-Known Cultivated Plant from Northern 
South America 
By Ricuarp Evans Scuuures. . . . . . . . 299 
Number 6 (January 16, 1959) 
New Considerations in an Old Genus: Datura 
By Arrnur S. Barchay ....... . . . 245 
The Present Distribution of Narcotics and Stimu- 
lants Amongst the Indian Tribes of Colombia 
By Nesror Uscatrecur M. ..... . . . . 278 
Plantae Colombianae X V 
By Ricuarp Evans ScHuutrEs. ..... . . 805 
On the Validity of the Generic Name Cochleanthes 
Raf. 
By Ricnarp Evans Scuutres AND LesuiE A. 
GARAY ............2.2. 2.2. .821 
NuMBER 7 (February 20, 1959) 
The Origin of Corn. I. Pod Corn, the Ancestral 
Form 
By Paun C. MaNGELsporr AND Rosertr G. 
REEVES. 2. 2...) B29 
NuMBER 8 (March 10, 1959) 
The Origin of Corn. II. Teosinte, a Hybrid of 
Corn and Tripsacum 
By Roperr G. Reeves anp Patt C. 
MANGELSDORF . 
os 
It 
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[ vi ] 
