PLATE XVIII 
Fig. i. -A plant of the Yuma variety of Egyptian cotton, photographed on July 15, 
1913, showing the well-developed vegetative branches and the rather poorly devel¬ 
oped lower fruiting branches. 
Fig. 2. -A plant of the Pima variety of Egyptian cotton, photographed on July 15, 
1913, showing the absence of vegetative branches and the presence of well-developed 
fruiting branches at the low nodes on the axis. * 
Fig* 3. A plant of the Gila variety of Egyptian cotton, photographed on July 15, 
1913, showing in comparison with the Yuma variety (PI. XVIII, fig. 1) a smaller 
development of the vegetative branches. 
