PROBLEMS TO SOLVE. 383 



Chapter IX. Can Jasius larvae be raised on 

 rose leaves ? 



Do Arbutus fruits cause paralysis ? 



Chapter X. Origin of the operculum in the flower 

 of Eucalyptus ? 



Does Punica possess deciduous . staminate 

 flowers ? 



Chapter XI. Etymology of " Eraxinet " ? 



Chapter XII. What conditions govern the 

 capricious distribution on the Riviera of Euphorbia 

 dendroides f 



Purpose of the imitative seed of Ricinus ? 



Are the fruits of Euphorbia lathyris innocuous, 

 the plant being poisonous ? 



Why are the Conifers confined to the northern 

 slopes of the mountains ? 



Chapter XIII. Has the flowering of the Arundo 

 donax any connection with the weather ? 



Is it due to the drier air of Nice that Thais is 

 wanting, and that tree-ferns do not flourish as well as 

 at Cannes ? 



Chapter XIV. Are hermaphrodite (perfect) 

 Maize flowers rare ? 



Chapter XVII. Does Capparis spinosa in this 

 district ever turn the edges of the leaves to the sky ? 

 Does the fruit ripen ? 



Chapter XX. What is the wall-plant which 

 revealed the existence of a ruin ? 



Chapter XXIII. Nicotiana glauca and Diplo- 

 taxis tenuifolia are conspicuously successful in 

 resisting drought. In virtue of what special adaptation 

 do they thus flourish almost without water ? 



Wanted, a complete list of Riviera leafless plants. 



