ON TRANSPARENT INJECTED PREPARATIONS. 131 



stance do we find the age of the embryo mentioned. This is 

 a matter of importance, and, if possible, should be attached to 

 the slide. An experienced observer would undoubtedly be 

 able to make out the age of the embryo from the structure of 

 its organs; but as these preparations are mainly intended for 

 students, this is an important point to be attended to. 



Pathological anatomy. — The principal subjects illustrated 

 under this head are epithelial cancer, the granulating surfaces 

 of ulcers, and the cicatrices of united wounds. 



Such a collection of anatomical preparations as these are 

 very suggestive of the applications of the microscope. Here 

 in these few slides we have a perfect museum of histological 

 structures, and the student with these at hand and his 

 microscope can form a better idea of the nature of an organ, 

 and the functions it possesses, than if he spent years amongst 

 preparations in spirits with nothing but his eye to direct him. 

 This is even more remarkably the case with pathological 

 specimens. The mere superficial examination of a morbid 

 part with the eye can furnish but little real information with 

 regard to the nature of diseased structures, but let the micro- 

 scope be applied and the distinctions and resemblances become 

 obvious at once which had before been hidden. 



With regard to the series of preparations before us, we 

 would suggest that it would be very desirable that the speci- 

 mens should be mounted on slides which will fit our English 

 cabinets. None of them require the clumsy width of glass 

 which they now occupy, and would be much improved for 

 examination if they were on narrower slides. We would 

 also suggest to Messrs. Smith and Beck that they should get 

 some one to translate the contracted Latin in which the 

 names of the specimens are written on the slides, into English. 

 It is not very easy to make out the Latin always as their 

 catalogue indicates, but it would be worth an effort to make 

 these beautiful preparations as widely useful as they deserve. 



