JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE VII, 



Illustrating Dr. Klein's paper on the * Minute Anatomy of 

 the Nasal Mucous Membrane.' 



Fig. 1. — Transverse section through the nasal septum and adjoining part 

 of the upper jaw of the guinea-pig. Magnifying power about 12 

 diameters. 



1. Spongy bone of the upper jaw, in the middle line. 



2. The same at the side. 



3. A tooth cut transversely, showing its dentin and vascular pulp. 



4. Osseous substance projecting from the lower jaw in the middle 

 line into the nasal cavity as the nasal crest. 



5. The osseous substance of the lower concha or turbinal bone. 



6. The cartilaginous septum narium. 



7. The cartilaginous capsule of the organ of Jacobson. 



8. The organ of Jacobson. 



9. Tlie accessory organ of Jacobson. 



10. The epithelium covering the mucous membrane of the concha 

 and nasal surface of the upper jaw. In the mucous membrane are seen 

 numerous glands, 



11. The furrow between the alveolar process of the upper jaw and 

 the nasal septum. 



12. The epithelium of the mucous membrane of the nasal septum, 

 the latter containing numerous glands. 



13. A lymph-follicle. 



The epithelium covering the nasal surface of the upper jaw, from a down- 

 wards past the lower sulcus at 11, and over the surface of the nasal septum 

 is stratified columnar epithelium, the superficial cells being ciliated. From 

 a to by the epithelium consists of a superficial layer of short columnar and 

 a deep layer of short conical epithelial cells ; no cilia on the superficial 

 cells. From b, over c, to d, the epithelium is stratified pavement epithelium, 

 with a superficial stratum of horny scales, like the stratum corneum of the 

 epidermis. Owing to the very small scale on which the drawing is made, 

 these details could not be shown. 



Fig. 2. — F'roma transverse section through the nasal septum of the guinea- 

 pig. Magnifying power about 45. 



1. The organ of Jacobson. 



2. The hyaline cartilage. The cartilage-cells are not indicated. 



3. The bone. The bone- cells are not drawn here, but the spaces 

 for the blood-vessels are indicated. 



