Ohap. XVI. PINGUICULA LUSITANICA. 393 



nor Could tliis have been expected, for even had glands 

 existed here, the long bristles would have prevented the 

 albumen from coming in contact with them. On both leaves 

 the bits were now pushed close to one margin, and in 3 hrs. 

 30 m. this became so greatly inflected that the outer surface 

 touched the blade ; the opposite margin not being in the least 

 affected. After three days the margins of both leaves with the 

 albumen were still as much inflected as ever, and the glands 

 were still secreting copiously. With Pinguicula vulgaris I have 

 never seen inflection lasting so long. 



(4) Two cabbage seeds, after being soaked for an hour in water, 

 were placed near the margin of a leaf, and caused in 3 hrs. 

 20 m. increased secretion and incurvation. After 24 hrs. the 

 leaf was partially unfolded, but the glands were still secreting 

 freely. These began to dry in 48 hrs., and after 72 hrs. were 

 almost dry. The two seeds were then placed on damp sand 

 under favoui'able conditions for growth; but they never ger- 

 minated, and a-fter a time were found rotten. They had no 

 doubt been killed by the secretion. 



(5) Small bits of a spniach leaf caused in 1 hr. 20 m. 

 increased secretion ; and after 3 hrs. 20 m. plain incurvation of 

 the margin. The margin was well inflected after 9 hrs. 15 m., 

 but after 24 hrs. was almost fully re-expanded. The glands 

 in contact with the spinach became dry in 72 hrs. Bits of 

 albumen had been placed the day before on the opposite margin 

 of this same leaf, as well as on that of a leaf with cabbage 

 seeds, and these margins remained closely inflected for 72 hrs., 

 showing how much more enduring is the effect of albumen than 

 of spinach leaves or cabbage seeds. 



(6) A row of small fragments of glass was laid along one 

 margin of a leaf; no effect was produced in 2 hrs. 10 m., but 

 after 3 hrs. 25 m. there seemed to be a trace of inflection, and 

 this was distinct, though not strongly marked, after 6 hrs. The 

 glands in contact with the fragments now secreted more freely 

 than before; so that they appear to be more easily excited 

 by the pressure of inorganic objects than are the glands of Fi7i- 

 guicula vulgaris. The above shght inflection of the margin had 

 not increased after 24 hrs., and the glands were now beginning 

 to dry. The surface of a leaf, near the midrib and towards 

 the base, was rubbed and scratched for some time, but no 

 movement ensued. The long hairs which are situated here 

 were treated in the same manner, with no effect. This latter 

 trial was made because I thought that the hairs might perhaps 

 be sensitive to a touch, Like the filaments of Dionsea. 



