ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 285 



other public speaker, the whole of his speech * ; a lecturer, the whole of 

 his lecture ; and a detective the features of three hundred criminals, and 

 so on, to an almost indefinite extent. 



Having now particularly described and ascertained the nature of my 

 said invention, and in what manner the same is to be performed, I 

 declare that what I claim is : 



The combination in the instrument called the ' microphotoscope ' of 

 a single fixed or adjustable lens or Microscope with movable or detach- 

 able circular glasses or other media containing one or more circular or 

 concentric groups of microphotographs, so arranged that each or any 

 microphotograph may be brought separately under or before the said 

 fixed or adjustable lens or Microscope (instead of each microphotograph 

 being provided with a separate lens) substantially as hereinbefore 

 particularly described and illustrated by the drawings annexed." 



Bastin-Bullock Microscope. 



[" Designed by Prof. Bastin especially for the needs of pharmacognosies."] 



Amer. Mon. Micr. Journ. IX. (1888) p. 35, from Western Druggist. 

 Electric Microscope. 



["We learn that Prof. Waldeyer of Berlin is having an electric Microscope 

 constructed in Vienna for electric light demonstrations. We presume this 

 instrument is to take the place once occupied by the Solar Microscope."] 



Scientif. JS'ews, I. (1S88) p. 52. 

 Mi not, C. S. — American Microscopes — A Complaint. 



[A very sweeping condemnation of American Microscopes, and a recommenda- 

 tion to Americans to purchase only European ones.] 



Science, 1887, December 2nd. 



[Comments on same in Microscope, VIII. (1S8.S) pp. 20-2 ; 



Amer. Mon. Micr. Journ., IX. (1888) p. 15; Bot. Gazette, XIII. (18S8) pp. 38-9 ; 



Queen's Micr. Ball., IV. (1887) pp. 41-3.] 



(2) Eye-pieces and Objectives. 



Apochromatic Objectives.! — We give Mr. E. Gundlach's paper on 

 this subject in extenso, for, like his previous papers, any attempt at 

 abstract would conflict with the proper appreciation of his views. 



" The almost generally prevailing opinion, that the Microscope 

 objective has been brought so near to perfection as to leave little or 

 nothing for its further improvement, has been greatly modified by the 

 appearance of new and superior material of which to construct optical 

 lenses — the apochromatic glass of Schott & Co., of Jena, Germany. 

 The fact that this new glass has solved the long-pending problem of 

 removing or reducing the secondary spectrum, has naturally aroused the 

 most sanguine hopes for a general improvement of the Microscope 

 objective. These hopes would doubtless long ago have been realized, 

 through the efforts of the able opticians of the world, if the new glass 

 did not have, aside from the great virtue of reducing the secondary 

 spectrum to a minimum, some serious drawbacks not connected with 

 other optical glass. In fact, if the new glass were, or could be made, in 

 every respect similar to the ordinary optical glass, the objectives could 

 bo made of it in exactly the same manner and after the same formulas as 

 they are now, and their optical qualities would be just the same in every 



* In the specification to the patent of 18S4 the member of parliament was only to 

 have the " facts and figures relating to the subject of his speech." 



t Bead before the American Society of Microscopists, Pittsburg, August 30th, 

 1887. The Microscope, viii. (1888) pp. 6-8. 



1888. X 



