Am. Jour. Sci., Vol. XXXI, 1886. 



Plate V. 



2 x* No 7* 



IHUfT 



4 xi6o 



« 



6 X160 



6 xao 



7 xi60 



v4tiM*pc 



ir^ 



Fig. I. Eegistration board. 2. Movement of tendril No. 7a reduced to one-half 

 actual size. 3. Cross section of tendril arm. showing the tissue during the active 

 period : a, a', a", Collenchyma. b, V, b", Vibrogen tissue, c, c', c", Thin-walled 

 parenchyma rilled with protoplapm and some chlorophyl. d. d', d", Concentric 

 band of wood tissue x 20. 4. Wood tissue as shown at d, d', d" x 160 : A, Grow- 

 ing wood cells as they appear during the active period. B, The same wood cells 

 very much thickened, as they appear after motion has ceased. 5. Vibrogen 

 tissue as seen at b. V, b" x 80. 6. Collenchyma tissue, as seen at a, a', a" x 160. 

 7. Continuity of the protoplasm in the collenchyma tissue, obtained by treatment 

 with concentrated H 2 S0 4 and stained with picric aniline x 160. 



