Intelligence and Miscellanies. 391 
maline are more electric by heat than the entire tourmaline, 
and that when the latter is very long, it cannot acquire the 
pyro-electric virtue. We were then ignorant that M. Brews- 
ter had made analagous experiments under date of Aug. 2d 
1824. The following are the expressions of the Scotch phi- 
losopher: “In examining the electricity of the tourmaline. 
I have found that it is much more easily observed with a small 
placed on a glass and heated to a boiling temperature, the 
fragment adheres to the glass with so much force that on in- 
verting it, the fragment remains suspended during six or 
eight hours. In this manner, pieces of considerable thick- 
ness and surface are capable of supporting their own 
weight. He adds further, that the dust of the enurhathie 
adheres in a mass when heated on a glass, and stirred with a 
dry substance.—Ferussac’s Bulletin, Nov. 1828. 
46. New method of preserving Crystallized Salts; by M. 
Deuchar.—Agreeably to the statement of the author, salts 
may be prevented from efflorescing or burning liquid, by 
charging the air of the vessel in which they are kept with the 
vapor of the spirits of turpentine. It is sufficient for this 
purpose to + i a very small quantity on the bottom of the 
vessel.—Ibi 
47, Conversion of potatoe flour into nutritious bread— 
Darcet proposes, in order to render the bread of potatoe flour 
as palatable and nutritious as that of wheat, that some animal 
substance should be added to the mixtures, and this he finds 
may be gelatine, or caseous matter. In 1821 he proposed 
to add gelatine to wheat flour for the purpose of making a 
more nutritious biscuit for the use of the navy, and some of 
these were prepared under — Spetbamti on} a voyage of 
circumnavigation now under the command of M. De Durville. 
The wheat flour — by the beckons bins Paris, Hatin a 
Water, - 
ean.’ - - : - os 
Stare - - - - 73 
eich cries ma after, BS é Bg 
Gummo-glutinous matters; oe CAS 3 
