38 INTRODUCTION. 



rank. In Italy, Amici ; in England, Ross, Powell, and others, produce 

 instruments quite equal to the above, but out of the question for Ger- 

 many ; among small, cheap, but not particularly useful instruments for 

 students and physicians, for 115 to 150 francs, George Oberhauser 

 (Rue Dauphine, 19, Paris), furnishes the best. The much-famed instru- 

 ments of Nachet are good, but inferior to those of Oberhauser ; on the 

 other hand, the small ones of Schiek for 40 thalers [30 dollars], and those 

 of Plossl for 70 to 100 Fl. [30 to 45 dollars], would be very serviceable 

 if these artists were as productive as Oberhauser.* For the use of the mi- 

 croscope I refer to J. Vogel, " Anleitung zum Gebrauche des Mikroskops" 

 (Leipzig, 1841); H. von Mohl, "Mikrographie" (Tubingen, 1846); Hart- 

 ing, " Het Mikroskoop deszelfs gebruik, geschiedenis en tegenwoordige 

 toestand" (Utrecht, 1848-50), 3 Theile; Purkinje, article "Mikroskop," 

 in Wagner's " Handworterbuch der Physiologic," Bd. 2, 1844; in which 

 works, as well as in that of Quekett, " A Practical Treatise on the Use 

 of the Microscope" (London, 1848, translated, by Hartmann, Weimar, 

 1850, [also Ed. 2, London, 1852)] ; and Robin, " Du Microscope et des 

 Injections dans leurs applications a 1'Anatomie et a la Pathologic" 

 (Paris, 1848), the preparation of microscopical objects is in part very 

 elaborately treated of. 



A collection of microscopical preparations is indispensably necessary 

 for a more exact study of Histology, especially sections of bones and 

 teeth and injections. Every one may with a little trouble, form a mode- 

 rate collection for himself, hints towards which he will find in the para- 

 graphs standing at the end of each section of the special part, as 

 well as in the works just cited. Microscopical preparations may also 

 be exchanged with or purchased of Hyrtl, in Vienna ; Dr. Oschatz, in 

 Berlin ; Topping, Smith, and Beck, Hett and others, in London ; and 

 also in Paris. The largest private and public collections of microscopi- 

 cal preparations exist in Vienna, with Hyrtl (injections) ; in Utrecht, 

 with Harting and Schroder van der Kolk (injections, sections, muscles, 

 nerves) ; in London, in the College of Surgeons (animal and vegetable 

 tissues of all kinds); with Tomes (sections of bones and teeth) ; and 

 with Carpenter (hard tissues of the lower animals). 



* [The opinion expressed in the above lines with regard to microscopes seems entirely 

 too national. For clearness of definition of the object glasses and neatness of the stand, the 

 instruments furnished by Ross, and Powell, and Lealand, are not only " quite equal/' but 

 far superior to those of PlOssl, Oberhauser, or Scliiek, the only objection to them being their 

 high price. Of the cheaper microscopes, those most used at present in this country and in 

 England are the small instruments of Nachet (Rue Serpente, Paris), the glasses of which 

 are superior to those of PlOssl and Schiek, whilst the great convenience of the present stand, 

 modelled according to the English style, renders them preferable to those of Oberhauser. 

 In this country microscopes have been made by Mr. Spencer, of New York, the lenses 

 of which are not inferior to the best glasses either of Ross, or of Powell and Lealand, but 

 which are as yet too expensive to be introduced into general use. 



