DESCRIPTION AND ANALYSIS OF YENITE. 1^9 



stiffness, when its elastic force is diminished by the weather: spring will 



and the contrary effect will take place when the spring be- j^hotw ather 



comes more rigid by cold. 



An adjustment for temperature has been applied in chro- A former ad- 



nometers several years aao, by means of a pair of tongs, or J"^^'"^'" ?" * 

 .*, n , c I. ■ similar panci- 



double expansion bar, or the same nature as it the sprmg pig, 



were to pass through the variable notch A B in the present 

 ligure. Whether Mr. Hardy's contrivance will afford supe- 

 rior advantages in its effect, or in the convenience of dis- 

 posing the parts, must be referred, like all things of this . 

 oature, to trial. 



W. N. 



XIT. 



Pf the Yenife, a new Mineral Substance : by Mr. LE LiEyiiE, 

 Member of the Institute, Counsellor of Mines, ^c* 



HEN I was sent to the isle of Elba five years ago as 

 commissary of the governrnent, I thought I might avail my- 

 self of the opportunity, to study and make known the mi- 

 neralogy of a conntry so interesting to the naturalist. The 

 business of my ofUce, however, having occupied nearly the 

 whole time I spent in that island, did not allow me to carry 

 this design into execution : but my journey will not have 

 proved altogether fruitless to the science of mineralogy ; for, 

 beside the mineral that forms the subject of the present pa- Minerals from 

 per, I have brought with me some others, that may prove ^'^ ^^'^ °^ 

 interesting to the mineralogist. Such are 



1. A green substance, that has some resemblance to acti- A new mineral. 

 pote, and a considerable analogy to that which I am about 



to describe. 



2. Transparent white emeralds, some of which are three white eme- 

 centimetres [1-18 inch] long. '■aids. 



3. Black, yellow, and rose-coloured tourmalins. Tourmalins. 



4. Rose-coloured and white lepidolite, lamellar and com- Lepidolite. 

 pact. 



♦ Journal des Mines, No. 21, p. 65. Extracted from a paper read at 

 the meeting of the Institute, December the 29tb, 1806, 

 ■■ ■ 5. A 



