Root-production extraordinary. This photo shows the natural aerial roots 

 of a tropical vine growing in the Cycad House of the Missouri Botanical 

 Garden, St. Louis, U.S.A. In this greenhouse these roots attain a length'of 

 40 feet, not branching at all unless they strike soil or moist material. The 

 roots here shown owe nothing to artificial growth-substances, and the 

 illustration is given as a matter of general interest. 



According to John A. Moore (1933), from whose paper the photograph 

 is reproduced, the vine shown had been in the greenhouse only five years. 

 It was included by Zimmerman and Hitchcock (1935, H) in a series of plants 

 subjected to the action of root-forming substances, towards which it behaved 

 in no unusual way. The botanical name of this vine is Cissus sicyoides L. var. 

 jfacqiiini. 



