Microscopical Essays, 



143 



fome care is, however, requifite in this reparation, otherwife the 

 fkin may be made too thin, fo as not to enable you to form an 

 accurate idea of it's organization. 



The exuviae of infeBs are in general a very pleating objea, 

 and require but little preparation. If they are curled or bent up, 

 keep them in a moift atmofphere for a few hours, and they will 

 foon become fo relaxed that you may extend them with eafe to 

 their natural pofitions. The fleam of warm water anfwers the 

 purpofe very well. 



The beard of the lepas anitifera is to be foaked in clean foft 

 water, and frequently brufhed while wet with a camel's hair pen- 

 cil ; it may then be left to dry : after which it muft be again 

 brufhed with a dry pencil, to difengage and feparate the hairs, 

 which are apt to adhere together. A picture of this object is 

 reprefented in Plate XIII. Fig. 1. 



To view the muscular fibres, take a very thin piece of 

 dried flefh, and lay it upon a flip of glafs, and moiften it with 

 warm water ; when this is evaporated, the veffels will appear 

 plain and more vifible, and by repeated macerations the parts 

 may be further' difengaged. 



To examine fat, brains, and other fimilar fubftances, we are 

 advifed by Dr. Hooke to render the furface fmooth, by preffing 

 it between two thin plates of flat glafs ; by which the fubftance 

 will be made much thinner and more tranfparent ; otherwife the 

 parts lying thick one upon the other, it appears confufed and 

 indiftin£L 



Some 



