76 Caution ta Cliemisls.— Verdigris. — Defonatbig Oil. 



which it assumes an oleaginous form, and partly pasbes through 

 the paper filter. This combination, it appears, may exist in different 

 proportions, which I have not been ai)lc yet to determine ; ex- 

 cept that it cloes not putrefv: whereas in t!ie others, a fetid 

 smell arises in a few davs, and much huer than if the gelatine 

 was pure. The combinations of the gallic acid with gelatine 

 and extractive matter unite less iVeelv with v.ater, and resemble 

 much the precipitates formed by the infusion of nut-galls in the 

 geldthiQus solution. 



A CAUTION TO CHEMISTS. 



M. Scliaringer, an eminent chemist of Vienna, died lately, 

 from the fatal effects of a chemical experiment. While preparing 

 the prussic acid {acithnn /or as. si cum) and the most powerful 

 poison known, he spilled a considerable quantity on his naked 

 arui^ and died in a few hours in great agonies. 



VEUDIGIUS. 



Seilor Orpita has found that great quantities of dry sugar taken 

 into the stomach of a patient who had recently swallowed ver- 

 digris, or eaten food prepared in untinncd coiJ))er vessels, have 

 proved an immediate and effectual antidote to tlie cupreous poi- 

 son. In cases where the ]>oison has remained so long in the 

 stomach as to produce inflammation, the usual remedies for the 

 latter must be conjoined with the sugar. 



petonatijS'g oil. 

 The original discovery of this substance, which has been 

 claimed by M. Dulong, and actually discovered by Davy, appears 

 to belong to M. ^'an Mons of Brussels. This distinguished 

 chemist, whose discoveries have often been appropriated by 

 others, observed in 1/93 the combination of ammonia with 

 oxygenated muriatic acid. Nineteen years before the experi- 

 ments of Dulong or Davy, he announced his discovery to Gren, 

 in the following term>, dated Messidor, An -4 (1796): "I have 

 succeeded in combining ammonia with oxymuriatic acid without 

 anv decomposition whatever of these two bodies. This new salt 

 detonates at a certain degree of heat, v.hether in the open air, 

 under water, or under oi'ner liquids bv which it is not decom- 

 posed""-." The same facts were stated in Dandolo's Italian 

 translation of Van Mons's Chemical Philosophy, " II muriato 

 o5sigenato d'ammoniaco si reduce a suoi principi e detona a con- 



* " Es ist mer tjeluruen das ammifik injt dcr oxigenirteii salzsanre zu 

 verbiiideii oline d;iss dahey eine zcrsetziing dicser substanzen vorgcgtingen 

 uadf. liieses iie.iCS zalz dL'toiiii't bog eiiiem tievvisseii f;rad de waerrae, 

 Mnvohl in i'rcyer hilt a! s uiitcr wasscr uiid andticii tropfljartn llnssigkeiten 

 die cs uiclu zuragizcu." Ncucs Journal dcr Fhj/$ik, Bd. iJ, s. 230. 



forza 



