14 REPORT—1850. 
He then proceeds to a diagram explanatory of the Ragusan earthquake : 
“Verum ut magis sibi constet hec nostra opinio, ac solidius firmetur, ipsi 
diligentius hic consideremus singulares omnes illos affectus qui supradictis 
materiis dum terram movent atque exitum suum moliuntur possunt adscribi 
quocumque modo debeant prorumpere: statuo igitur hane figuram. ABCF 
sit hypogeeum seu locus 
subterraneus in quo 
materia ejusmodi reclu- 
ditur. Ragusium sit in 
D, Venetiz in E, Nea- 
polis in I—Pars terre 
concusse sit in E, Ὁ, 
O, I hoc supposito— vi- 
detur certe quod spiri- 
tus ille exituriens de- 
beat | quaquaversum 
spherice agere ac dif- 
fundi nempe ab A ad 
C, ad B et ad F, ita 
tamen ut haud dubie 
longe violentius feratur 
ipa in altum secundum li- 
neam perpendicularem ad B quam per lineas obliquas AC et AF, cum de 
spirituum ejusmodi natura sit potissimum ut perpendiculariter in altum de- 
ferantur : atque adeo sua succussione deferent terram BD versus G, ut con- 
tigit Ragusii, ubi et exhalationes et flamme et odores ac similia visa sunt 
expirare.” : 
Travagini then proceeds further to develope the conditions according to 
which the pulses (succussationes) will travel to the outward points of his 
diagram. He finds the vast mass of matter moved in the directions AH, 
AO, by the smaller force in these directions, a difficulty in his way ; and by 
another diagram (which I copy as an illustration of the peculiar mode of 
treatment of the author) he proposes to show the effect of distance upon the 
pulses and their mode of propagation :— 
« Certum enim quod iteratos dicti mallei ictus omnia vibrabuntur versus 
illam partem ad quam ictus illi adiguntur, et quod tamen ipsa tabula uulla- 
tenus usquam discessit a loco suo aut divelletur ab aliis tabulis contiguis.’ 
He then proceeds to show by another pair of diagrams, how that upward and 
downward pulses of the earth’s crust may produce a lateral swing in bodies 
