INVERTED MICROSCOPE: 



A NEW FORM OF MICROSCOPE; WITH DESCRIPTION OF A 

 NEW MICROMETER AND GONIOMETER. 



The instrument forming the subject of this article was 

 invented by me in the summer of 1850, and first brought to 

 the notice of the Societe de Biologie of Paris in the month of 

 September of the same year, and with additional improvements 

 in the micrometer movement was laid before the American 

 Scientific Association in 1851. Besides the mention made 

 of this instrument in the minutes of the proceedings of those 

 scientific bodies, no account of it has been published giving a 

 full detail of the objects sought after and effected by this new 

 form of microscope; and this I now hasten to do, in justice to 

 myself, since seeing in the last edition of Quekett's work on 

 the microscope a short description of this instrument under the 

 title of Nachet's Chemical Microscope. How it is that my name 

 has been entirely omitted in connection with it is a mystery 

 to me; it must have arisen through Mr. Nachet's neglect to 

 mention who the inventor of it was while exhibiting it at the 

 World's Fair in London in 1862, or through the forgetfulness 

 of Mr. Quekett after being informed on the subject. This omis- 

 sion is still more glaring, from the fact that the instrument as 

 then exhibited, with one or two very unimportant modifications, 

 is the same in all its mechanical details as was constructed for 

 me, from my plans, by Mr. Nachet, of Paris, and used in the 

 laboratory of Messrs. Wurtz and Yerdiel. 



I am sorry to be obliged to preface the description of the 

 microscope with this reclamation ; but after considerable expe- 

 rience I feel that the instrument is an important one for general 

 as well as chemical purposes, and that it will in time be consid- 

 ered a decided advancement in the construction of microscopes. 

 With these views in the matter I am unwilling to yield what 

 little credit might be due the inventor of it. 



