186 



D. P. Penhallow — Tendril Movements in 



described must show that the total latitudes (assuming the 

 three bands to be of equal size and strength, which they are, 

 approximately) are one-half the total departures of movement. 

 The following table exhibits the latitudes and departures for 

 the thirteen tendrils experimented upon. 



TENDRIL MOVEMENTS. 





Total Latitudes and Departures. 





No. 



Lat. 



Dep. 



1 



124-30 



249-70 



2 



53-25 



116-60 



3 



123-35 



269-40 



4 



21-00 



60-83 



5 c 



43-37 



91-10 



5 b - c 



241-80 



398-55 



6 a - b 



141-75 



266-55 



h a 



87-75 



192-80 



7 b 



47-75 



69-30 



8 a 



106-30 



264-70 



8 b 



67-65 



203-03 



8 C 



53-20 



144-50 



9 



122-40 



118-15 



Totals 



1193-87 



2445-21 



Means 



91-84 



188-09 



Ratio 



1 : 



2-05 



From this it will be seen that the total mean fully confirms 

 our theoretical considerations, giving in round numbers, lati* 

 tudes 91 and departures 188, or a ratio of 1 : 2-05. An inspec- 

 tion of the figures for each tendril, shows that in many, this 

 ratio is fully preserved ; in others, the excess is in favor of the 

 latitudes, but we have already shown that the lateral range is 

 greatest in the most active tendrils, and that the motions be- 

 came more irregular and in latitude, greater, as the tendril 

 becomes older. Since it has alread}' been explained, that the 

 vibrogen tissue induces torsion of the tendril, it is clear that 

 this latter is intimately associated with thecircumnutation, since 

 both have a common origin. 



Spasmodic Movement. — It has already been noted that the 

 movement of the tendril becomes somewhat spasmodic toward 

 the close of its active period. Periods of rest, or of actual'cessa- 

 tion of motion not only occur, but there is often greater irregu- 

 larity of movement, and a failure to make those grand sweeps, 

 often so conspicuous a feature of the rapid circumnutations. 

 If we bear in mind the gradual modification of the tissues dur- 

 ing the period of movement, and more particularly toward the 

 end of activity, the proper explanation will be easily reached 



