Armored Against Iis Enemies 
The desert cactus shown in the accompanying direct color 
photograph print portrays a typical arrangement of armor, 
although many forms of cactus are more heavily spined even than 
this. In addition to the large bristling spines which fan out in 
every direction, there are hidden behind each rosette a 
bundle of undeveloped spines, numbering often as 
high as ten thousand to each eye. When the 
outward spines are cut off, these push 
their way forward with surpris- 
ing rapidity to protect the 
gap in the armor. 
