9&&D& ( 
bus ortum trahant. Particulas enim aquofas me¬ 
diante calore a corporibus telluris afcendere, eas- 
demque cum fubtiliffima materie inflammabili, in 
aere reperiundo, combinari ficque acidum primi¬ 
genium, ad naturam acidi vitriolici accedens, gene¬ 
rari, Cl. Au&or oftendit. Jam vero ab hoc acido 
primigenio, vniuerfali, ope materiae luminis, ab 
inflammabili diuerfae, cum fubtiliffima materia in- 
flammabili combinato fulphur illud principiale 
oriri hocque miris iftis fulminis visque eleftricae 
phaenomenis ortum praebere, in nubibus colle&um, 
eas ele&ricas reddere atque, his in motum excitatis, 
ab eodem motu ac attritu accendi et accenfum 
omnem fibi in fua direGione obuiam materiem ac¬ 
cendere, ab aere propelli vimque fuam exercere, ex 
Noftri fententia ftatuendum eft. Quod tandem ad 
velocitatem materiae elecfricae et fulmineae perti¬ 
net, eam a fubtilitate, puritate ac leuitate iftius ma¬ 
teriae, nec non a motu eiusdem imprelfo, vehemen* 
temque iftius a&ionem a velocitate ifta, adiuuante 
inlimul aeris aflione, dependere, fonitum vero, 
i£ium fulminis comitantem, a conculfu particula¬ 
rum aeris elafticarumprouenire,Nofter arbitratur, 
IV. 
Obfervations on the Changes of the Air and 
the concomitant epidemical Diseales ? >in the 
Island of Barbados. To which is added a 
Treatife on the putrid bilious Fever com- 
naonly called the Y ellow Fever and fuch other 
dileafes as are indigenous or endemia! in the 
Weft India Islands, or in the Torrid Zone. 
By william hilla ry M. D. London prin- 
ted for C. Hitch and L. Hawes, 1759. 8vo 
mai. 1 ajph. 1 pl, 
h. e. 
