760 SEC. 18. BIOLOGY. 



3518. Old-fashioned Simple, Compound, and Solar 

 Microscope combined; date about 1800 (?). 



Essex and Chelmsford Museum, Chelmsford. 



Very perfect specimen of old-fashioned simple, compound, and solar micro- 

 scope combined ; presented to the Essex and Chelmsford Museum by the late 

 J. Disney, Esq., F.R.S., about 50 years ago, believed to have been then old, 

 and to have cost originally 40/. 



This specimen affords a good example of the progress of. mechanical con- 

 struction. The movement for shading the mirror is so completely super- 

 seded as to be a novelty. 



Though effecting one object well it has given way to more complicated 

 motions adapted to many uses. 



3519. Old-fashioned Solar Microscope ; date about 

 1800 (?). Essex and Chelmsford Museum. 



Presented to the Museum by the late J. Disney, Esq., F.R.S., about 50 

 years ago. 



3519a. Culpeper Microscope, made about 1790. 



E. Russell Sadden. 



A compound microscope of the form contrived by Mr. Culpeper. It consists 

 of a large external brass body, supported upon three scrolls fixed to the stage, 

 which is supported on three larger scrolls screwed to a brass pedestal. A con- 

 cave mirror is fitted to a socket in the centre of the pedestal. 



3520. Microscope used by Sir W. Hooker, and em- 

 ployed by him in describing the British Jungermannice, Musci 

 exotici, &c. J. D. Hooker, M.D., P.R.S. 



3521. Microscope used by Dawson Turner. 



J. D. Hooker, M.D., PM.S. 



3522. Microscope which belonged to Robert Brown, and 



was employed by him in his various botanical researches. 



J. D. Hooker, M.D., P.R.S. 



3523. Copy of Microscope used by Louis Claude Marie 

 Richard in the Analyse du fruit, made for Robert Brown. 



J. D. Hooker, M.D., P.R.S. 



3524. Large Microscope, made by S. Plcessl, of Vienna, 

 in 1845. With screw micrometer and other accessory apparatus. 

 (Property of Prof. F. Cohn.) 



Prof. Fcrd. Cohn, of the Institute of Vegetable Physiology 



in the University of Breslau. 



This microscope of Simon Plo3ssl was used by Prof. F. Cohn in all his 

 researches during the years 1845-1862, and affords a historical proof of the 

 degree of perfection attained by microscope manufacturers 30 years ago, as at 

 the time that it was constructed it was considered one of the best instruments 

 on. the Continent. 



3525. Microscope used by P. Lyonet in taking observations 

 with respect to the Cossus ligniperda. H. Ottmans, Amsterdam. 



These observations are described in his Treatise on the Anatomy of the 

 Caterpillar, 1760. 



