luckan: abutilon theophrasti. 227 



Root. 



Starch is present in the medullary rays. Methylene blue showed 

 very little mucilage in the root. It was present only as a thin film 

 in a few of the cell walls of the cortex. Fattj^ oil is present in the 

 stroma of elaioplasts. Fresh sections soaked in solvents of oil, 

 choloroform, ether and xylene, and then stained with Sudan III, 

 showed the oil had been dissolved out and the stroma was partially 

 collapsed. Tests for volatile oil were negative. 



Protein tests are not decisive, because the cell walls of the lig- 

 nified tissue became brick red with Millon's reagent. When these 

 walls were tested with aniline sulphate and phloroglucin, they 

 gave the lignin reaction. 



Seed. 



Sections of soaked seed treated with Sudan III and iodine 

 showed a large amount of oil in the endosperm and also in the 

 embryo. 



Sections of seed treated with Millon 's reagent turned red in the 

 region of the endosperm and cotyledons, indicating the presence 

 of protein as a reserve food. Other sections treated with iodine 

 showed no starch was present. 



Methylene blue showed no indications of mucilage. 



BIBLIOGRAPHY. 



Beer, R. ('09). On Elaioplasts. Annals of Botany XXIII, 63. 



Haberlandt, G. ('14). Physiological Plant Anatomy. 



KuNTZE, George ('91). Beitrage zur Vergleichende Anatomie der Mal- 



vacien. Botanisches Centralblatt, XLV, 161. 

 MOLISH, H. ('13). Mikrochemie der Pflanzen. 

 Nestler, a. ('99). Sekretropfen an den Laubblattern von Phaseolus multi- 



florus und der Malvaceen. Berichte d. deutschen Botanischen Gesell- 



schaft, XVII, 332. 

 PoLlTis, J. ('11). Sugli Elaipolasti nelle Mono e Dicotilendoni. Real Ac- 



cademia dei Lincee' XX, 599. 

 Solereder, H. ('08). Systematic Anatomy of the Dicotyledons, 146, 842. 

 Stevens, W. C. ('16). Plant Anatomy. 

 Strasburger, E. ('13). Das Botanische Praktikum. 

 TuNMANN, O. ('13). Pfianzenmikrochemie. 



