THE INJECTED TRUNKS OF CHESTNUT TREES 493 



LITERATURE CITED. 



1. RuMBOLD, Caroline. Methods of Injecting Trees. Phytopathology, 5: 



225-229. 1915. 



2. MoELLER, Joseph. Anatomie der Baumrinden, p. 68. Berlin, 1882. 



3. ScHiLBERSZKY, Karl. Kunstlich hervorgerufene Bildung sekundarer (ex- 



tra faszikularer) Gefassbiindel bei Dikotyledonen. Ber. d. D. bot. Ges., 

 10: 424. 1892. 



EXPLANATION OF PLATES.^ 



Fig. I. Unstained free-hand section. Section cut from a tree eight years 

 old, injected with methylene blue during the latter part of April. The tree 

 was felled in October. Dilution of methylene blue solution was i gram to 4 

 liters of water. 



Fig. 2. Auerbach stain. Section cut from a tree nine years old injected 

 in May with meta-cresol i-iooo G.M. The branch was cut from the tree in 

 October. 



Fig. 3. Delafield's hsematoxylon. Section cut from a ten-year-old tree 

 injected June and July with nitrophenol-para 1-500 G.M. Tree felled in 

 November. 



Fig. 4. Auerbach stain. Section cut from sixteen-year-old tree injected 

 with lithium carbonate 1-500 G.M. in July, August, September and October. 

 Tree felled in November. 



Fig. 5. An enlargement of a part of Fig. 4. 



Fig. 6. Auerbach stain. Section cut from the tree shown in Figs. 4 and 5. 



Fig. 7. An enlargement of a part of Fig. 6. 



Fig. 8. An enlargement of a part of Fig. 7. 



Fig. 9. Heidenheim's iron alum hsematoxylose. Section cut from a 

 fourteen-year-old tree, which was injected May, June and July with nitro- 

 phenol-para i-iooo G.M. Tree felled in November. 



Fig. id. Auerbach stain. Section cut from a fourteen-year-old tree 

 which was injected in June and July with picric acid i-iooo G.M. Tree felled 

 in November. 



Fig. II. An enlargement of a part of Fig. 10. 



