Miscellanies. 393 



happen so soon in the healthy portion. Of course, this is not of so 

 much importance in pans habitually covered by the dress. 



3. To have the parts to which the nitrate is applied protected from 

 the light, during the use of it. 



4. To wash away the solution before it dries in the least from the 

 fingers he. dipped in it in making the application. This may be 

 done in common clean water, and if not effectually done in that, it 

 may be certainly done in a weak solution of corrosive sublimate, as 

 appears from our experience. . 



15. Dissection of the eye of the Halibut (Pleuronectes Hyppo- 

 glossus, L.) by W. C. Wallace, one of the Physicians to the North- 

 ern Dispensary, N. Y. — The eye is oblong. It is every where 

 surrounded by a firm elastic cartilage excepting the cornea and a 

 •short space around the entrance of the optic nerve that is occupied 

 by a fibrous covering. Beneath this cartilage there is a considera- 

 ble quantity of a glairy watery fluid, between it and the next coat, 

 which has a silvery appearance. Within the cartilage, around the 

 entrance of the optic nerve, the ophthalmic artery ramifies into a 

 great number of branches : these pass into a red spongy body nearly 

 surrounding the nerve and at a distance of from two to six lines from 

 it. From this arises a plexus of very minute red vessels which pro- 

 ceed to the circumference of the iris. Some of them go to the com- 

 pletely circular lens and enter at one point on the inner and at anoth- 

 er on the outer side, so that it is poised like a terrestrial globe on its 

 axis. A nerve of considerable size enters with the optic nerve, pro- 

 ceeds along the choroid coat on the inner side to the iris where it di- 

 vides into three branches, two of which go to the iris, while the most 

 considerable passes to the lens at its internal axis. The lining mem- 

 brane of the cornea is reflected over the iris except at its inferior in- 

 ternal part, where there are different attachments leaving sufficient 

 space for communication between the anterior chamber and the cavi- 

 ty between the cartilage and the eye-ball, containing what may be 

 termed the aqueous humor. 



When the cartilage is compressed, the aqueous humor finds its way 

 into the anterior chamber and the cornea becomes more convex. 

 When the pressure is removed, the cartilage by its own elasticity re- 

 sumes its shape and the cornea by external pressure is flattened* 

 Some of the muscles act upon the transparent cuticle that covers the 

 cornea, and in this way it may be more accurately adjusted. 



