I. MICROSCOPES. 911 



3569. Microscope, with two eyepieces and four objectives. 



E. Leitz, Wetzlar. 



3570. Microscope, with two eyepieces and three objectives. 



E. Leitz, Wetzlar. 



3571. Microscope, with two eyepieces and three objectives. 



E. Leitz, Wetzlar. 



3572. Microscope, with one eyepiece and two objectives. 



E. Leitz, Wetzlar. 



These instruments are exhibited as specimens of accurate and elegant work, 

 combining solidity and cheapness. 



3572a. Microscope, large model, with arrangement for the 

 study of rocks with polarised light. A. Nachet, Paris. 



3572b. Microscope, with camera obscura, for photographing 

 microscopic objects, arrangement of M. Aime Girard. 



A. Nachet, Paris. 



3572c. Microscope for demonstration, which can be passed 

 from hand to hand in histological lectures. A. Nachet, Paris. 



3572d. Portable Microscope. A. Nachet, Paris. 



357 2e. Binocular Microscope, producing at will the 

 effects of the stereoscope and the pseudoscope. A. Nachet, Paris. 



3572f. Microscope for the study of the cornea and of the 

 pupil. A. Nachet, Paris 



3572ff. Nachet's first form of Binocular Microscope. 



F. Crisp. 

 3572g. Nachet's later form of Binocular Microscope 



(both stereoscopic and pseudoscopic). F. Crisp. 



3572h. Wenham's Binocular Microscope for high 

 powers. F. Crisp. 



3572i. Ahrens' Binocular Microscope, with double 

 similar prisms. F. Crisp. 



3572j. Ahren's Binocular Microscope, with prism of 

 Iceland Spar (using the ordinary and extraordinary images). 



F. Crisp. 



3572k. Holmes' divided Object Glass Binocular Mi- 

 croscope (the object glass being cut in halves and each half 



form ins: one of the images). F. Crisp. 



& &. J r 



35721. Tolles' Binocular Eyepiece. F. Crisp. 



