180 KRAEMER — CONTINUITY OF PROTOPLASM. [April 4, 



Fig. 2. Potato s'arcli grain with point of growth and alternate lamella; dark. 

 Fig. 3. Pctato starch grain treated with aqueous solution of gentian violet. 

 Fig. 4. Potato starch grain treated with gentian violet and showing crystalloidal 



structure in alternate lamellae. 

 Fig. 5. Wheat starch grain treated with water at 60O C, or with chromic acid 



and other reagents (see footnote *). 

 Fig. 6. Wheat starch grain treated with water at a temperature of 65O C, or 



with the reagents mentioned in footnote *, but for a longer time. 

 Fig. 7. Wheat starch grain treated with aqueous safranin solution. 

 Fig. 8. Cells of the endosperm of Date seed (^Phcetiix dactylifera), the one 



normal and the other showmg the stratification of the wall after treatment 



with chlor-zinc-iodide. 



Plate XXII. 



Fig. 9. Cell of vegetable ivory [Phytelepkas macrocarpa), showing lamellation 

 and crystalline structure in the wall after treatment with chlor-zinc-iodide, 

 clove oil, chromic acid or other reagents. 



Fig. 10. Pore of vegetable ivory showing cleft in middle lamella. 



Figs. II and 12. Pores of vegetable ivory showing striae between neighboring 

 cells after treatment with sulphuric acid and gentian violet. 



Fig. 13. Cells of endosperm of the seed of Strychnos Nux vomica after treat- 

 ment with iodine solution. 



Fig. 14. Cell of endosperm of seed of Nux vomica treated with sulphuric acid^ 

 and gentian violet. 



