129 



Catalogue of Transparent Injected Preparations. Sold by 

 Smith and i3eck, London. 



Messrs. Smttii and Beck having sent us up a selection from 

 the transparent injected preparations which they now have 

 on salcj we feel we shall be doing a service to our readers 

 by calling their attention to them. We believe these prepa- 

 rations are not made in this country; but from whatever part 

 of the world they are obtained, they claim the merit of being 

 the most successfully mounted microscopic preparations that 

 have yet been offered to the public for sale. In the catalogue 

 the preparations are arranged under distinct heads, according 

 to the part or organ of the animal system from which they 

 are obtained ; and, perhaps, we cannot give our readers a 

 better idea of the nature and variety of these preparations, 

 than by referring to them under the various subdivisions 

 adopted in the catalogue. 



, Nervous system. — in this series we have sections of various 

 parts of the nervous system. A highly interesting and in- 

 structive series is one of six transverse sections of the me- 

 dulla elongata, from its commencement up to its union with 

 the corpora quadi'igemina. These are made from the rabbit. 

 There are also preparations of the human brain and of the 

 human optic nerve. It must, however, be borne in mind, 

 that in these preparations the principal part of the structure 

 elucidated is the distribution of the smaller blood-vessels. 

 It is, in fact, in the extraordinary delicacy of the injections 

 that one of the great merits of these preparations exists. 



Eye. — The whole series devoted to the eye are exceedingly 

 delicate and beautiful. It begins with several preparations 

 of the human eye, as the eyelids, the cornea, sclerotica, and 

 conjunctiva, the iris, ciliary processes, and choroid. The pre- 

 paration of some of the structures of the eye in situ, as illus- 

 trated in the preparations from the rat, are very instructive. 

 In one of these the distribution of the various branches ot 

 the posterior ciliary artery, and of the circular artery of the 

 iris, is seen ; Avhilst in another the whole of the ramifications 

 of the capsular artery on the posterior surface of the lens is 

 exhibited. In another preparation from the rabbit, the whole 

 of the vascular part of the retina is given. Dissections of 

 the new-born cat's eyes display the pupillary membrane. 

 These preparations of the eye will be found exceedingly valua- 

 ble to the student, as supplying to him for permanent ob- 

 servation those parts in the structure of the eye, Avhich cannot 



AOL. I. NEW SER. K 



