Number 6 (May 10, 1956) 
Archaeological Evidence on the Evolution of Maize 
in Northwestern Mexico 
By Paut C. MANGELSDORF AND Rosperr H. 
LASTER « «ok 6 Be we we ww ee se es et JS] 
NuMBER 7 (June 26, 1956) 
Orchidaceae Neotropicales I 
By RicHarp Evans SCHULTES ....... 179 
Notes on Peruvian Orchids 
By CHARLES SCHWEINFURTH ........ 2ll 
Numpser 8 (December 26, 1956) 
Evolution Leading to the Formation of the Cupu- 
late Fruit Case in the American Maydeae 
By Watton C. GaALINAT ......... 217 
Number 9 (January 22, 1957) 
A New Method of Coca Preparation in the Colom- 
bian Amazon 
By Ricuarp Evans ScuutrEs . . . . . . . 241 
The Genus Quararibea in Mexico and the Use of 
its Flowers as a Spice for Chocolate 
By Ricuarp Evans ScHULTES . . 2...) .). 247 
Number 10 (March 18, 1957) 
The Ordeal Poisons of Madagascar and Africa 
By GrorcE L. Ropp . . . . . 265 
