86 MICROSCOPICAL RESEARCH 



PLATE VIII. 



STEM STRUCTUEE. 



Fig. 27. Transverse section. Stem of Indian Corn. ' Zea mais ' 

 x25<iia. Fixed in 92% Aleotol. Stained with Borax 

 Carmine and Malachite Green. 1. Epidermal tissue. 

 2. Vascular bundle. 3. Bundle-sheath. 4. Phloem. 5. Large 

 pitted vessel. 6. Annular vessel. 7. Primary ground 

 tissue. 



Fig. 28. Longitudinal section passing through a primaiy vascular 

 bundle. Stem of Indian Corn. ' Zea mais ' x 50 dia. 

 Stained as in Fig. 27. 1. Primary ground tissue. 2. Large 

 pitted vessels. 3. Annular vessel. 4. Spiral vessel. 



Fig. 29. Transverse section through Rachis of Fern. 'Pteris 

 aquilina ' x 40 dia. Fixed in Chromo-Acetic solution. 

 Staining as in above figures. 1. Primary ground tissue. 

 2. Endodermis. 3. Bast sheath. 4. Bast. 5. Scalariform 

 vessels. 6. Spiral vessels. 



Fig. 30. Longitudinal section of Rhizome of Fern. ' Pteris aquilina ' 

 X 60 dia. Fixed and stained as above. 1. Primary ground 

 tissue. 2. Sclerenchyma sheath. 3. Bast. 4. Spiral vessels. 

 5. Scalariform vessels. 



