EXPLANATION OF THE ILLUSTRATION 
Prare XXXITL. Left. Two cobs resembling those 
of the race Dzit-Bacal, which is common in Yuca- 
tan and Campeche. Right. ‘Two cobs resembling 
those of the race Breve de Padilla, a modern race 
of maize grown in the state of Tamaulipas, Mex- 
ico. Natural size. 
