196 QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE. 



then white anhydrous creosote added, which soon makes them 

 transhicent without destroying the colour, and they can then 

 be transferred to Canada balsam or dammar. They must not 

 be left more than two hours in creosote, and must still be 

 shielded from the light, which precaution is to be observed 

 even when the preparations are complete and transferred to 

 the cabinet. 



VIII. Organs of Sense. — 1. Olfactory mucous membrane. — 

 Martin (' Journal of Anatomy and Physiology,' November, 



1873, p. 39) has worked at the structure of the olfactory 

 mucous membrane, especially with a view to examine the 

 distinction drawn by Max Schultze between the two classes 

 of cells, epithelial and olfactory, met with in this region, a 

 distinction which Exner denies. In the olfactory epithelium 

 of the newt these two kinds of cells are very distinct, and no 

 intermediate form is seen. They are clearly demonstrable on 

 teasing out preparations hardened in spirit or Miiller's fluid. 

 The epithelial cells possess a large oval granular nucleus, sur- 

 rounded by a homogeneous structureless layer, from which 

 proceed one or more * central processes ; ' a ' peripheral pro- 

 cess ' proceeds from the other end of the cell. In the olfacT 

 tory cells the nucleus is round, hardly granular, and has a 

 single central process. In the frog the two kinds of cells are 

 less distinct, partly because the nuclei of both are oval. In 

 the olfactory epithelium of the dog the two forms are quite 

 distinct, though differing somewhat from the corresponding 

 cells in the newt. 



The conclusion is that the two forms of cell met with in 

 the olfactory region are anatomically quite distinct, as 

 described by Max Schultze, and do not shade off into one 

 another. The contrary opinion arrived at by Exner is due in 

 great part to his having chiefly worked at the frog, where the 

 olfactory and epithelial cells do approximate to one another 

 in several points. It is doubtful whether the cells possess 

 any such difference of function as is implied by these terms. 



IX. Vascular System.— 1. Morano (' Centralblatt,' No. 1, 



1874, p. 3) describes the lymphatic sheaths of the capillary 

 blood-vessels in the choroid coat of the eye. 



2. Klein C Proc. Royal Society,' No. 149, 1874) pubhshes 

 his " Contributions to the Normal and Pathological Anatomy 

 of the Lymphatic System of the Lungs," of which we must 

 defer a notice. 



X. Digestive Organs and Glands.— 1. Tee^A.— Legros and 

 Magitot have studied the development of teeth in mammalia, 

 and describe, in their first memoir, the origin and formation 

 of the dental follicle. (Robin's ' Journal de I'Anatomie, 



