ox HUMAN HAIR. J4"[ 



incorporated, are soft to the touch like an alkaline lixi- 

 vium ; and that they leave an alcdline residuum on eva- 

 poration ; it will be easy to deduce the following theory. 



The cement with which the lapis lazuli is mixed is in- Theory of ul- 

 tended to impart oil to the ultramarine, to form a kind of tramariQe. 

 soap, which the warm vater carries away, rendering it a 

 little soluble; while the gangue remains united to the 

 cement, in the midst of which it is fur from being so 

 easily wetted as the ultramarine, because of its want of 

 soda ; in consequence of which it cannot slip like the 

 ultramarine from the fatty, resinous substance, that forms 

 a kind of net for it. In short the process of extraction 

 of ultramarine is a r3al saponation \^f^avonnage^ ; an 

 expression in which we hope we may be indulged on ac- 

 count of its fitness. 



These are the conclusions, that we think may be drawn 

 from our labours, without being too bold. May this first 

 attempt on a substance so little known and so singular 

 be followed hy its artificial production. 



X. 



Abstract of a Memoir on Human Hair*; read at thq 

 National Institute on the 2rd of March^ hi} M. Vau- 



QUELIN+. 



JL HE principal objects the author proposed to himself obiect of in- 

 was, to investigate the nature of the animal matter of quiry;the sub- 

 which hairs are formed, and to ascertain whether there ®^^"^^ ®^ "^^' 

 were any thing analogous to it in the animal economy. 

 In the coprse of his experiments, however, phenomena j^^^ ^ ^^^ 

 presented themselves, which, appearing foreign to the phenomena to 

 principal substance, led him farther than he had intended, ^'^^mme the 

 It did not originally enter into his plan, to inquire whence ter. 

 the various colours of hair are derived, yet on this sub- 

 ject his attention was most employed. It is only, ob- 

 serves Mr. Vauquelin, by attending a long time to the 



♦ Annalesde Chimie, Vol. LVHI. p. 41. 



t Messrs. Chevreuil and Caballe, two of Mr. Vauquelin's pupJls, 

 agisted hini in making the experiments recorded in this Memoir. 



same 



