PLATE 6s 



Some of the hybrids of Porcirus trifoliata, showing vigor, type of growth, leaf 

 characters, and relative susceptibility to citrus-canker, arranged in order of their 

 susceptibility: 



A. — P. trifoliata. 



B. — Rusk citrange. 



C. — Citruraelo. 



D.— Citradia. 



E . — Citrandarin . 



F. — Cicitrange. 



G. — CitrangHma. 



H. — Citrangequat. 



