Microscopical Essays, 67 



pleafure to the mind : there is alfo, in the ufe of this inflrument 

 no occafion to fhut that eye which is not directed to the object. 



A further advantage peculiar to this microfcope is, that by it 

 the outlines of every object may be taken, even by thofe who are 

 not accuflomed to draw ; while thofe who can draw well, will 

 receive great affiflance, and execute their work with more accu- 

 racy, and in lefs time than they would otherwife have been able 

 to have performed it in. Mori of the defigns for this work were 

 taken with the lucernal microfcope ; and, I hope, the accuracy 

 with which they are executed, will be deemed a fufficient 

 teflimony in favour of the inflrument. In this point of view, it 

 will, I think, be found of great ufe to the anatomifl, the botanift, 

 the entomologifl, &c. as it will enable them not only toinvefli- 

 gate the object of their refearches, but to convey to others 

 accurate delineations of the fubjeft they wifli to defcribe. 



By the addition of a tin lanthorn to this apparatus, tranfparent 

 objects may be thrown on a fcreen, and exhibited at one view to 

 a large company, as by the folar microfcope. 



Tranfparent objects may be examined with this inflrument in 

 three or four different modes ; from a blaze of light almoft too 

 great for the eye to bear, to that which is perfectly eafy to it. 



When this inflrument is fitted up in the bell way, we generally 

 fend a fmall double and Jingle microfcope with it. 



Fig. 1, Plate JEreprefents the improved lucernal micro- 

 Scope, mounted 10 view opake objeds ; ABCDE is a large 



I £ mahogany 



