Every Inch Protected 
Not only in the form of cactus shown here, but in 
practically every form, the spines are so arranged as to protect 
every inch of the surface. It will be seen that it would scarcely be 
possible to touch a finger to the skin of the cactus plant above, 
so completely does the armor protect it. This form of 
caclus also gives an interesting illustration of the 
fact that away back in its history, the plant, 
instead of having flat slabs, had round 
slalks. In this picture the three 
joints of the round silalk 
can be clearly seen, 
