JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATES XVI & XVII, 

 Illustrating Dr. Klein's paper on the " Organ of Jacobson/' 



All figui-es are drawn with the camera lucida. 



Figs. 1, 2, 3, 4, and 7 are drawn under a magnifying power of a little 

 over 16 ; figs. 5 and 6 under one of about 50 ; fig. 8 drawn under one of 

 about 320 ; figs. 9 and 10 under one of about 30. 



In figs. 1, 2, 3, 4, 5, 6, and 7 the numbers have the following meaning : 



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

 turbinated bone. 2». The osseous substance of the lower turbi- 

 nated bone. 3. The cartilage of Jacobson. 4. The lower nasal 

 furrow. 5. The naso-lachrymal duct. 6. An alveolar cavity in the 

 superior maxilla. 7. The bone of the superior maxilla. 8. The 

 epithelium covering the mucous membrane of the nasal septum, 

 9. Tlie epithelium covering the mucous membrane of the lower 

 turbinated bone. 10. Tat tissue in the middle line of the 

 superior maxilla. 11. Osseous substance around the Jacobson's 

 cartilage. 12. The mouth of the organ of Jacobson in open 

 communication with the lower nasal furrow. 13. The organ of 

 Jacobson already a closed tube. 14. The blood-vessels of the 

 cavernous tissue in the lateral wall of Jacobson's organ. 15. The 

 gland alveoli in the wall of Jacobson's organ. IG. The osseous 

 substance of the crista nasalis of tiie superior maxilla. 17. Spaces 

 containing the bundles of the olfactory nerve supplying the organ of 

 Jacobson. 18. Venous plexus near the epithelium lining the naso- 

 lachrymal duct. 19. Arterial vessels. 20. The tissue of the wall 

 of the duct. 21. A lymph-follicle. 



Fig. 8. — From a longitudinal section through the wall of the naso-lachrymal 

 duct. 

 1. The stratified columnar epithelium lining the inner cavity, a. The 

 superficial cylindrical cells, b. The deep small cells, c. The intra- 

 epithelial cavities containing cells and capillary blood-vessels. 2. The 

 sub-epithelial layer of connective tissue. 3. Large veins in section, 

 forming the " sub-epithelial venous plexus." 4. The tissue of the 

 outer part of the wall. 5. An artery. 6. A lymph-follicle. 7. A 

 vein in transverse section. 



Figs. 9 and 10 are transverse sections through the Stenoaian ducts. The 

 meaning of the letters is — 

 A. Anterior wall. P. Posterior wall. b. Blood-vessels, c. The Ste- 

 nonian cartilage, e. The stratified pavement epithelium, t. The 

 fibrous tissue of the wall of the duct. s. The lumen of the duct. 



