JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF FIGURES OF PLATE XXVI, 



Illustrating Dr. Klein's Memoir on the " Organ of Ja- 

 cobson in the Dog." 



Figs. 1, 2, 3, 4, 5, 6, 7, and 8, are outline drawings of successive trans- 

 verse sections through the parts containing the canal of Stenson and the 

 anterior portion of the organ of Jacobson of one side, very slightly magni- 

 fied. 



The meaning of the letters is : — b. Bone. I. Middle line. c. Cartilage. 

 in fig. 1. Opening or mouth of Stenson's canal, p. Surface of palate. 

 pp in figs. 1 and 2. Papilla at the mouth of Stenson's canal. S. Stenson's 

 canal. /. Jacobson's organ. 



In Figs. 7 and 8, in addition :— ;/. Lower nasal furrow, m. Mucous 

 membrane covering the nasal septum, sc. Cartilage of nasal septum. 



Figs. 9, 10, and 14 are copies of photographs taken by my friend Dr. 

 George Maddox, to whom T am greatly indebted. The individual parts 

 are understood by a reference to figs. 11 and 15. 



Fig. 14 is a representation of the organ of Jacobson of the right side of 

 fig. 9, but under a higher power. 



In Fig. 11 the meaning is of : — 1. Upper bone lamella of the crista 

 nasalis. 2. The middle bone or the intermaxillary bone. 3. The lower 

 portion continuous with the palatine plate of the superior maxilla, c. 

 Jacobson's cartilage. /. Jacobson's organ, sc. Septal cartilage, m. Mucous 

 membrane of the nasal septum. 



Figs. 12 and 13 are representations of successive transverse sections 

 through the posterior extremity of the organ of Jacobson. b. Bone of the 

 crista nasalis. c. Jacobson's cartilage. /. Jacobson's organ, m. Mucous 

 membrane of the nasal septum, sc. Septal cartilage. 



Fig. 15. — From a transverse section through the organ of Jacobson in 

 about its middle. Magnifying power about 50. c. Inner boundary line of 

 Jacobson's cartilage, b. Transverse sections through blood-vessels, g. 

 Serous glands, n. Transverse sections through branches of the olfactory 

 nerve. /. Lateral wall of organ of Jacobson. m. Median wall of same. 

 s. Septum between lateral wall of organ of Jacobson and the mucous mem- 

 brane of nasal septum. 



Fig. 16. — From a vertical section through the sensory epithelium of the 

 median wall. Magnifying power about 750. c. Superficial cuticle, e. 

 "Epithelial" cells, s. "Sensory" cells, b. Deepest layer of epithelial 

 cells. 



