Account of a Thunder-form in Scotland. 
perfon’s feet and through them only; which would not be 
the cafe, were the perfon to be knocked down or killed by any 
main llroke of explofion, either pofitive or negative. 
Thefie things are evident. But the manner in which Lau- 
der and the two horfes were killed is not quite fo evident, 
though it appears to me to be very eafily accounted for. 
I will now ldate, in what manner I conceive that the clouds 
may have been placed, when the effects mentioned in Mr. 
Brydone’s Paper were produced. 
§ 13. I mu ft premile that, by that account, it appears, that 
the cloud was many miles in length ; inafmuch, as j aft before 
the “ loud report,” the lightning was at a very “ great dif- 
“ tance for Mr. Brydone “ obferved, by a {fop-watch, that 
“ the time that the found took to reach him was generally from 
“ 25 to 30 feconds.” 
Mr. Brydone relates, that the “ loud report refembled the 
“ firing of feveral mufkets, fo clofe together, that the ear 
“ could hardly feparate the founds, and was followed by no 
“ rumbling noife like the other claps.” 
This defeription indicates, that the ele&rical explofion was 
not far dilfant , and alfo fhews, that it was not extremely 
near : for, if the explofion had been extremely near, the ear 
could not at all have feparated the lounds. 
§ 1 4. Now let us fuppofe a cloud, eight, ten, or twelve 
miles in length (be the fame more or lefs) to be extended over 
the furface of the earth, in the fituation reprefented by ABC 
in the figure. (See Tab. VIII.) 
And let another cloud (as reprefented by DEF) be fituated 
between the above-mentioned cloud and the earth. 
* See Principles of Ele&ricity, from § 322. to § 327* inclufively. 
Vol. LXXVII. T Let. 
