Magnetifin.— Ventilation, 333) 
emitted a fulphureous vapour. The ruins are every where 
fo great, that all the gold and filver of America’ will hardly 
be. fufficient to repair the devaftation.’ The number of 
thofe who have loft their lives cannot be afcertained ; but 
it mutt be very confiderable. The provinces of Riobamba, 
&c. have fuffered moft: in the laft many died of hunger, 
_and even of thirft, as all the water was corrupted. © In other 
diftricts-the fhocks {til continue; and the lakes throw up 
flames. At Sambagna and Timba new rivers have burft 
forth at different places.’ 
SINGULAR MAGNETIC PHENOMENON, 
In the Reich/fanzciger, a German periodical work, No. 
CCXXII. for 1797, it is faid, that a certain perfon having an 
artificial magnet fufpended from the wall of his ftudy with av 
- piece of iron adhering to it, remarked, for feveral years, that 
the flies in the room, though they frequently placed them- 
felyes on other iron articles, never fettled on the artificial 
magnet; and even that if any of thefe infects approached 
it, they in a moment again removed from it to fome dif- 
tance. It is worth the trouble,” fays Profeffor Voigt,’ 
who.repeats the fame cireumftance in his Journal, **'to make 
farther obfervations on this phenomenon; and, were it 
confirmed, to magnetife iron might be employed to preferve’ 
it from being dirtied by flies. Perhaps it might’ be em- 
ployed alfo for other purpofes.” 
VENTILATION, ; ¥6) 
Dr. Van Marum has difcovered a very fimple method, 
proyed by repeated experiments, of preferying the, air! pure’ 
in large halls, theatres, hofpitals, &c.. The apparatus: for 
this purpofe is nothing but a common lamp, made) accords 
ing to Argand’s conftruction, fufpended from the roof of the», 
hall and kept burning under a funnel, the tube of which, rifes., 
above the roof without, and is furnifhed with |a;yentilator. 
For his firft experiment he filled his large Jaboratory with 
3 the 
