io6 MICROSCOPICAL RESEARCH 



PLATE XVIII. 



CELL STEUCTURE AND CELL CONTENTS. 



Fig. 63. Longitudinal median section through a grain of Wheat. 

 ' Triticum vulgaris ' x 10 dia. (Germinated in ' milk-warm ' 

 water for sixteen hours.) Fixed with Chromo-Aeetic 

 solution. (Unstained.) 1. The pericarp. 2. Aleur one -layer. 

 3. Endosperm (starch containing cells). 4. Remains of 

 stigma. 5. Scutellum. 6. The growing apex of stem. 

 7. Developing root. 8. Plumule sheath. 9. Root sheath. 



Fig. 64. Embryo of Wheat in longitudinal median section, after 

 germinating twenty-four hours x 40 dia. Fixed as above. 

 Stained with Brazilin. 1. Scutellum. 2. Developing root 

 (examine transverse section of radicals, Plate II., Fig. 5). 

 3. Root-cap. 4. Root sheath. 5. A developing lateral, or 

 secondary roolet. 6. Growing apex of stem. 7. Leaves in 

 various stages of development. 8. Plumule sheath. 9. Ligule. 



Fig. 65. Transverse section through a grain of Wheat x 76 dia. 

 Fixed as above. Stained with Brazilin. 1. Pericarp of 

 seed. 2. Crystal. 3. Aleurone layer. 4. The endosperm 

 cells containing starch. 



