Chap. VI.] DIGESTION. 85 



Experiment 2. The same experiment with the same result, only 

 one of the two bits of fibrin exciting the short surrounding tenta- 

 cles. This bit was so slowly acted on that after a day I pushed it 

 on to some fresh glands. In three days from the time when it was 

 first placed on the leaf it was completely dissolved. 



Experiment S. Bits of fibrin of about the same size as before 

 were placed on the discs of two leaves; these caused very little in- 

 flection in 23 hrs., but after 48 hrs. both were well clasped by the 

 surrounding short tentacles, and after an additional 24 hrs. were 

 completely dissolved. On the disc of one of these leaves much clear 

 acid fluid was left. 



Experiment J/. Similar bits of fibrin were placed on the discs of 

 two leaves; as after 2 hrs. the glands seemed rather dry, they were 

 freely moistened with saliva; this soon caused strong inflection 

 both of the tentacles and blades, with copious secretion from the 

 glands. In 18 hrs. the fibrin was completely liquefied, but un- 

 digested atoms still floated in the liquid; these, however, disap- 

 peared in under two additional days. 



From these experiments it is clear that the secretion 

 completely dissolves pure fibrin. The rate of dissolution is 

 rather slow; but this depends merely on this substance not 

 exciting the leaves suflSciently, so that only the immediately 

 adjoining tentacles are inflected, and the supply of secretion 

 is small. 



Syntonin. This substance, extracted from muscle, was 

 kindly prepared for me by Dr. Moore." Very differently 

 from fibrin, it acts quickly and energetically. Small por- 

 tions placed on the discs of three leaves caused their tentacles 

 and blades to be strongly inflected within 8 hrs. ; but no fur- 

 ther observations were made. It is probably due to the pres- 

 ence of this substance that raw meat is too powerful a stimu- 

 lant, often injuring or even killing the leaves. 



Areolar Tissue. Small portions of this tissue from a 

 sheep were placed on the discs of three leaves; these became 

 moderately well inflected in 24 hrs., but began to re-expand 

 after 48 hrs., and were fully re-expanded in 72 hrs., always 

 reckoning from the time when the bits were first given. This 

 substance, therefore, like fibrin, excites the leaves for only a 

 short time. The residue left on the leaves, after they were 

 fully re-expanded, was examined under a high power and 

 found much altered, but, owing to the presence of a quantity 



* [These results cnnnot be by the late Dr. Moore waa far 

 considered' trustworthy; it ap- from pure. F. D.J 

 pears that the syntooia prepared 



