464 Vreservaiiod of Eggs. — Rosin Bullies. — ]\foimtaw of Salt. 



PRESERVATION OF KGGS. 



The best method for preserving eggs, eitlier for zoological or 

 oacoaomical purposes, is by varnishing them with gum arable, 

 and tlien packing them in charcoal. Tiie gum is easily removed 

 by washing them in water, and the charcoal prevents sudden 

 alternations of temperature. — Edvi. Phil. Journal. 



ROSIN BUBBLES 



The following curious fact is mentioned in a letter to Dr. Silli- 

 nian from Mr. S. Morey, of Orford, New Hampshire : — 



If the end of a coj)j)er tube, or of a pipe stem* be dipped in 



* Tlie stem of a tobacco pipe, \vc presume to be here meant. — Kn. 

 melted rosin, at a temperature a little above that of boiling water, 

 taken out and held nearly iu a vertical position, and blown 

 throu^ii, bubbles will be formed of all possible sizes, from that 

 of a hen's egg do\vn to sizes which can hardly be discerned by 

 the naked eye ; and from their silvery lustre, and reflection of 

 the different rays of light, they have a pleasing appearance. 

 Some that have been formed these eight months, are as perfect 

 as when first made. They generally assume the form of a string 

 of beads, many of tiiem perfectly regular, and connected by a 

 verv fine fibre; but the production is never twice alike. If ex- 

 panded l)y hydrogen gas, they would probably occupy the upper 

 part of the room. 



Thv J ur7)ia(io/i of these bubbles is ascrilied to the common 

 cause, viz. the distension of a viscous fluid by one that is aeri- 

 form, : and their permayienCTj, to the sudden congelation of the 

 rosin, thus imprisoning the air by a thin film of solid matter, and 

 preventing its escape. — SiUiinun's American Jourtial. 



MOUNTAIN OF SALT. 



The story of the existence somewhere in the Trans-Mississippi 

 country of a large mountain of salt, has been recently revived. 

 Governor Miller, of Arkansaw, has written a letter, in which he 

 mentions an extent of country covered with fine crystallized salt, 

 •^ix inches deep. He adds, "All men agree, both whites and In- 

 dians, that this article is in such abundance, some distance above 

 where he was, that they cut and split off pieces a foot square." 

 ^' It may be true," ^,ays the New York Commercial Advertiser, 

 " that this vast mine of salt exists in the \^est; but wehave not 

 much confidence in Indian authority; and u'e should have been 

 much better satisfied of the fact, had Governor Miller traversed 

 the country and split off and preserved a footscjuare of the salt for 

 his own use. We all remember, that next to his red breeches, 

 Mri Jefferson was quizzed more upon this subject than any other; 

 and doubtless it was premature in the credulous philosopher to 

 Slate positively the existence of such a mountain, in a message to 

 Congress^ without better evidence of the fact than he po".se'.sced." 



