RELATIONS OF AXTS TO VASCULAR PLANTS. 



3 01 



and Sterculiaceae. This author has detected them on the leaves of 

 Cccropia, where they had been overlooked by previous observers. 

 Like the Miillerian and Beltian corpuscles, the bead-glands are rich in 

 fatty oils, proteins and sugar. In Bunchosia gaudicliandiana they are 

 visited by ants (Cremastogaster and Cryptoccrus), according to Fritz 

 M tiller. Other species, however, belonging to the genera Gnctum, 



&>-. 



FIG. 171. Tococa formicaria, from a specimen in the herbarium of the New York 



Botanical Garden. (Original.) 



Lcca and Pterospermum, which possess these glands, are described as 



' free from ants." Both the food bodies and the " Perldriisen " are 



uliviously modified glands, and differ from the nectaries much as 



certain animal structures, like the milk glands, in which the cells them- 



