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CHAPTER X. 



Manner of Observing with and Managing the Operative 

 Aplanatic Engiscope. 



By C. R. GORING, M. D. 



General Observations. — Select an apartment on the ground 

 floor, if possible, which has a northern exposure, and the 

 casement of which (it should have only one) is not over- 

 shadowed by trees or buildings, but presents a clear view 

 of the open sky — sky-lights are not proper for a micro- 

 scopic study. In such a room I would recommend you 

 to keep your instruments and apparatus, &c. open, and at 

 all times ready for observation ; but take especial care to 

 keep it locked, as if it was the case of your microscope, — 

 which, in fact, it may be termed. Have the fear of the 

 cat before your eyes, and also of all those busy, inter- 

 meddling, officious housewives, who, under pretence of 

 dusting, cleaning, and setting to rights, will subvert and 

 revolutionize the whole economy of your observatory, 

 and perhaps throw half your tackle behind the fire. 

 Never allow the apartment to be cleaned until you 

 have secured your apparatus. 1 think it myself a great 

 convenience (and I am not singular in my opinion) to 

 have an apartment especially devoted to my microscopes, 

 as much as the observatory of the astronomer is to his 



