Scrophulariaceae. 507 



of higher order which at their tips consist only of a few thin- 

 walled tracheids. According to information to hånd it seems 

 unquestionable that these glands are organs for the secretion 

 of water. 



As to the Pecliciilaris-gldinds it should be noted that 

 special water-paths from the tracheids to the basal cell of 

 the glandular hair, hmited by the cuticularisation of cell- 

 walls, as have been demonstrated in P. palustris by Percy 

 Groom, have not been able to be demonstrated in any of 

 the species investigated here. A bursting and crumbhng- 

 away of the ciiticle on a small circiilar spot in the middle 

 of the glandular head, such as the author in question men- 

 tions in connection with P. palustris, was very common in 

 P.lapponica ånd P. S cepti'um carolinum, and was occasion- 

 ally also found in other species. 



Glandular hairs with a 2 to several-celled stalk and a 

 2 — 4 celled head were present in Castilleia pallida, Euphrasia 

 arctica, Bartschia alpina, and also in P. flammea. 



