JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATES XXX & XXXI, 



Illustrating Dr. Klein^s paper " On the Organ of Jacobson 

 in the Rabbit/' 



Pigs. 1 and 2 are transverse sections through the nasal organ anterior to 

 the organ of Jacobson; fig. 3 is a transverse section through tbj nasal 

 organ in the region of the mouth of the organ of Jacobson ; figs. 4, 5, 6, 

 and 7, are transverse sections in the middle region of the organ of Jacob- 

 son ; figs. 8 and 9 are transverse sections through the posterior extremity 

 of Jacobson's organ. Magnifying power about 30. Kg. 11 is from a 

 similar section as fig. G, more highly magnified, about 60. 



In all these figs., i.e. figs. 1, 2, 3, 4, 5, 6, 7, 8, 9, and 11, the meaning 

 of: 



1. The cartilage of the nasal septum. 2. The cartilage of the lateral 

 wall of the nasal furrow. 3. Jacobson's cartilage. 3a. Inner labium' 

 of Jacobson's cartilage. 4. Lower nasal furrow. 5. Naso-lachrymal 

 duct. 6. Tooth. 7. Superior maxilla. 8. Mucosa of nasal septum, 

 indicated. 9. Mucosa (plicated) of lower turbinated bone. 10. 

 Connective tissue above the palate, and containing in the front part 

 of the nasal organ (fig. 1) lobules of mucous secreting glands. 11. 

 Intermaxillary bone. 12. Mouth of Jacobson's organ. 13. 

 Jacobson's organ, 14. Cavernous layer of Jacobson's organ. 15. 

 Glandular layer of Jacobson's organ. IG. Glands of the mucosa 

 above the organ of Jacobson. 17. Stenson's cartilage. 18. Mucosa 

 lining Stenson's cartilage. 19. Lymph-follicles. 20. Fat cells 

 below the septal cartilage. 



Fig. 10. — From a transverse section through Jacobson's organ, similar to 

 the one shown in fig. 11, more highly magnified, about 90. 



1. Epithelium of the lateral wall. 2. Sensory epithelium. 3. Lymph- 

 follicle. 4. Mouth of duct of the glandfold. 5. Transverse 

 sections through the veins of the cavernous layer. 6. Arteries. 

 7. Veins in transverse section belonging to the median wall. 8. 

 Glands of the lower sulcus. 9. Glands of the upper sulcus. 10. 

 Transverse sections through bundles of olfactory nerve branches. 

 11. Plexus of these nerves in the median wall. 12. Inner boundary 

 of Jacobson's cartilage. 



Fig. 12. — From an oblique section through part of the median wall of 

 Jacobson's organ. Magnifying power about 500. 



1, Fine branches of olfactory nerve close to the sensory epithelium. 

 2. Large sensory cells extending from the sensory epithelium into 

 the adjoining subepithelial layer. 3. Sensory cells belonging to 

 the sensory epithelium. 



Fig. 13. — Part of the sensory epithelium in transverse section. Magnifying 

 power about 400. 



1. Epithelial cells. 2. Sensory cells. 



Fig. 14. — From a tranverse section through the naso-lachrymal duct. 

 Magnifying power about 90. 



1, Columnar stratified epithelium. 2. Veins of the subepithelial 

 plexus. 3. An artery. 4. Large lym])h-follicle. 5. Part of a 

 small lymph-i'oUicle. 6. Outer fibrous coat. 



