I. MICROSCOPES. 761 



3526. An Achromatic Microscope, made in 1807 by 

 Hermann van Deyl, in Holland, the first maker of true achromatic 

 objective lenses for microscopes. 



Professor Buys-Ballot, Utrecht, Holland. 



(See Harting, Das Mikroskop, iii., page 132, sqq., where this very micro- 

 scope is described.) 



3526a. Microscope of Nobili, 



Royal Institute of " Studii Superiori " at Florence. 



3527. An old Microscope, 1705, made by J. Marshall in 

 London, with seven objectives, objective table, object stand of 

 ebony wood, ivory plates, two pincettes, needle, and leaden 

 channel. Property of His Highness Prince Pless, Castle Fiir- 

 stenstein. Prof.Poleck, Committee of Breslau. 



3528. Microscope, by Musschenbook, in leather case. 



Royal Museum at Cassel (Director, Dr. Pinder). 



The microscopes exhibited are the* oldest in the collection of the Cassel 

 Museum. 



The microscope of Jan van Musschenbroek dates from the 17th century. 

 It has been frequently described and represented in drawings. The University 

 of Leyden possesses a similar one. This specimen was seen in 1809 by 

 Uffenbach in the collection^ of Prof essor Wolfarth in Cassel. 



3529. Two Microscopes, by Leutmann, in leather case. 



Royal Museum at Cassel (Director, Dr. Pinder}. 



These are microscopes by (or after) Leutmann, as is shown by the 

 drawing in Wolff's " Allerhand Niitzliche Versuche," III. Bd., p. 291. 

 Hurting gives no drawing of these microscopes. 



3530. Microscope, by Hartsoeker, in leather case. 



Royal Museum at Cassel (Director, Dr. Pinder). 



A microscope by Hartsoeker, invented before 1694. Wolff, who gives a 

 description and drawing of it, makes no mention of Hartsoeker as being its 

 inventor, but gives the description to that of Mvsschenbroek's instrument. 

 It was found by Uffenbach in Professor Wolfartk's collection. 



3529a. Large Amici Microscope, with apparatus complete, 

 by Chevalier. The Royal Microscopical Society. 



352 9b. Double Microscope, by Culpepper. 



The Royal Microscopical Society. 



352 9c. Single Microscope, by Dolland. 



The Royal Microscopical Society. 



3529d. Mechanical Finger, for picking up minute objects, 

 by Bailey, after Professor Smith's pattern. 



The Royal Microscopical Society. 



3529e. Double Microscope, by Marshall. 



The Royal Microscopical Society. 



