72 MICROSCOPICAL RESEARCH 



PLATE I. 



BOOT STRUCTURE. 



EiG. 1. Transverse section. Root of Buttercup. ' Ranunculus acris ' 

 x75dia. Fixed in 92% Alcohol. 1. Ground tissue 

 contaimng starch. 2. Endodermis.. 3. The four phloem 

 groups. 4. The four xylem groups. Stained Hsematoxylin 

 and Gossypimine. 



Fig. 2. Transverse section. Root of Pine. 'Pinus sylvestris' 

 X 75 dia. Fixed in 92% Alcohol. Stained Hsematoxylin 

 and Safranin. 1. Cortical tissue. 2. Phloem. 3. Cambium. 



4. Secondajy wood. 5. Primary wood. 6. Resin duct. 



Fig. 3. Transverse section. Root of Iris. 'Iris pseudo acorus ' 

 X 50 dia. Fixed in 92% Alcohol. Stained Hsematoxylin 

 and Safranin. 1. Primary ground tissue. 2. Endodermis. 



3. Large pitted vessels. 4. Phloem elements, stained purple. 



5. Xylem elements, stained red. 6. Developing lateral 

 rootlets. 7. Central axis of root. 



Fig. 4. Transverse section. Root of ' Zea mais " x 35 dia. Fixed 

 in 92% Alcohol. Stained Borax Carmine and Malachite 

 Green. 1. Cortical tissue. 2. Endodermis. 3. Xylem 

 elements, stained green; phloem elements, stained pink. 



4. Pith. 5. Developing lateral rootlets in various stages. 



