Process fur Dyeing Turkey Red. 43 



usually denote by the name of a new genus. I shall there- 

 fore establish the genus as follows : 



POLVPTEP.A. 



Charac. One branchio-stege radius ; two spiracles ; a great 

 number of dorsal fins. 



POLYPTERA BiCHIR. 



Inhabits the Nile. 



Explanation of the Plate. 



Fig. 1. (Plate I.) Polyptera. 



Fig. 2. the head seen from above, A B, aperture of the 

 spiracles. 



Fig. 3. insulated dorsal fin seen on one side, in which 

 maylbe observed the two points that terminate the osseous 

 radius. 



V. Account of the Process followed hj M. Pierrk Jaques 

 Pamllon for Dyeing Turkey Pwd. 



It is now some years since M. Papillon established a dye- 

 house at Glasoow for giving to cotton-yarn that beautiful 

 red colour kn"own by the name of Turkey or Adrianopk- 

 red. In the year 1790 the commissioners and trustees for 

 manufactures in Scotland paid a premium to M. Papillon 

 for communicating to the late Dr. Black, then professor of 

 chemistrv, Edinburgh, a description of his process, on con- 

 dition that it should not be divulged for a certain terni of 

 years, during which M. Papillon was to have the sole use 

 of his own secret. The term being now expired, the pro- 

 cess, as conmiunicated to Dr. Black, has been published, 

 ^nd is as follows : 



Receipt for Dyeing Cotton-Yarn a durable Red. 

 Step I. 

 For one hundred pound of cotton, you must have 

 100 lb. of alicante barilla. 



20 lb. of pearl-ashes. 

 100 lb. of (j[uicklime. 

 The barilla is mixed with soft water in a deep tuli -^vhich 

 has a small hole near the bottom of it, stopped at first with 

 a peg. This hole was covered in the inside -with a cloth, 

 supp'cjrled by two bricks, that ihc ashes mav be prevented 

 I'rom running out at it, or stopping it up while tl^ ley filters 



through it. 



L'ndcr 



