472 BOTANICAL GAZETTE [DECEMBER 
in all plants. However, it suggests a method of attack to be fol- 
lowed in working out other problems of a similar nature and 
scope. 
The problem of resin secretion in B. sagitiata is one limited to 
the field of an acid resin, non-tannin testing. For this type of resin, 
perhaps by far the most common, theories have been advanced 
rer er T 
5:40 35 20:25 gO 35.40 =4§.. 50.55 fo 65  7O 35. me 
t t Le | srry 2 | seth finds Mech Setetectbct ERet SS BMS EMSS Wie ale pital Chi | 
Fic. 2.—Coordinate plot, representing effect of balsamoresene on protoplasmic 
activity of Chara sp; the ordinates represent time flow and abscissas sequence of 
time 
advocating the origin from carbohydrates on the one hand, and the 
origin from terpenes on the other. Foremost of those advocating 
the former theory was WIESNER (24). He assumed that resins are 
derived from carbohydrates, specifically starch, by polymerization 
and reduction. As he knew, this fails to account for resin in the 
pine family, where there is a maximum production of resin but very 
little starch formation. WzuEsNER explained this on the basis that 
gallo-tannic acids operated to produce the change in this family. 
