52 



REGENERATION 



Experiment IV.— Oct. 22, 1921, to Nov. 15, 1921 



Grams 



Four long pieces of stem with four nodes each. 



Dry weight of stems 4 . 214 



Dry weight of 8 shoots 0.089 



Control. Four short basal pieces of two nodes each. 



Dry weight of stems 2.492 



Dry weight of 8 shoots . 0475 



Dry Weight 



OF Shoots 



PER Gram 



OF Stem, 



Milligram.^ 



21.0 



19.0 



Experiment V.— Oct. 11, 1921, to Nov. 1, 1921 



Grams 



Four long apical stems with six nodes each. 



Dry weight of stems 3 . 921 



Dry weight of 8 shoots 0. 113 



Dry weight of roots . 0134 



Control. Four basal pieces of two nodes each. 



Dry weight of stems 3 . 744 



Dry weight of 10 shoots . 090 



Dry Weight 



OF Shoots 



PER Gram 



OE Stem, 



Milligrams 



29.0 



24.0 



Experiment VI.— Dec. 11, 1921, to Jan. 17, 1922 



Grams 



Seven long apical stems with six nodes each. 



Dry weight of stems 6 . 634 



Dry weight of 12 shoots 0. 340 



Dry weight of roots . 0512 



Control. Seven short basal pieces of two nodes each. 



Dry weight of stems 3 . 560 



Dry weight of 12 shoots 0. 1770 



Dry weight of roots 0. 0128 



Dry Weight 



OF Shoots 



PER Gram 



of Stem, 



Milligrams 



51.0 



49.6 



We notice that the differences of shoots produced per gram of 

 dry weight of the controls differ comparatively little from those 

 produced by the large pieces of stem and in some cases the differ- 

 ence is only about 6 per cent. Considering the limitations in the 

 experimental conditions — the fact that part of the stem may not 

 function normally, especially the ends near the cut, or the fact 



