CALYCIFLOK.E. 



281 



and the third are aromatic oils especially developed in the vittse of the 

 pericarps. Many have the watery juices innocuous and the gum-resinous 

 secretion mild, so that they become esculent vegetables, which are ren- 

 dered still more bland when they acquire a more succulent condition under 

 cultivation. The absence of liht has a remarkable effect in preventing 

 the development of the aromatic principles, as is seen in blanched garden 

 Celerv and other cases. 



The Hemlock ( Conium maculatuni). 



A. number of the poisonous kinds are indigenous, one of which, Conium 

 maculatum, Hemlock (fig. 389), is in use in medicine as an anodyne. JEtliusa 

 Cynapium, Fool's Parsley, is a common weed ; Cireuta virosa, Water 

 Hemlock, is not uncommon ; C. maculata of North America is equally 

 poisonous ; (EnantJie crocata, Hemlock Dropwort, (E. PheHandrwm, and 

 other species are noted as poisonous, although they lose the property under 

 certain circumstances. Anthriscus sylvestris and cttlgaris are said to be 



