140 Objervations on Animal Eleétricity. 
thefe obfervations; for it is not fpecimens of rare objects 
merely that fhould be collected. The end, indeed, of the 
geological obferver is, not to form a cabinet of curiofities, 
but he muft carry away fragments af things apparently the 
moft common, when an exaét determination of their nature 
may be interefting to theory. People may thus employ, with 
advantage, the means of confirming or reétifying their firft 
obfervations, and of making profound refearches and compa- 
rifons impoffible to be made on the fpot *, 
[To be continued. | 
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——————————————e——eEeEESSSSeSSSeSSCaQaaoaoaoaoaoee eee 
Y. Obferuations on Animal EleGricity, and particularly that 
called Spontaneous. By J.J. HEMMER. 
[Concluded from Page 7. ] 
ig a letter, dated Jane 21, 1787, which I received from 
M. De Sauffure, he confeffes that he had not made any far- 
ther experiments on animal cle¢tricity; and that he did not 
know whether any had been made by others. As I was 
convinced, however, that a complete knowledge of that elec- 
tricity which is produced in the human body by the friétion, 
of the clothes, as well as fpontaneoufly, might be of great 
* We think i¢ our duty to fubjoin here fome advice to travellers in 
regard to the quettions which they may afk in the different towns. 
Whence do they procpre the materials proper for building; fuch as — 
lime, platter, tiles, flate, ftones of different kinds, and fand ? Dothey — 
burn turf or coal; and where are they found? Where do they procure 
their porter’s clay, fuller’s earth, the clay ufed for refining fugar, their 
whetftones and millftones? To obferve with what the ftreets are paved ; 
of what ftone the fteps of ftairs are formed; marks for boundaries, &c.; 
and to earn from what place they are brought. To afcertain oobieeitde y 
wells or the foundation of houfes are dug; and whether there are in the 
neighbourhood any rayjnes or prectpices. Thefe queftions will ferve to | 
facilitate the means of obferving the nature of the ground, by pointing 
eut the natyral or artificial excavations that may exift in the neighbour- 
hood, or which cught to be vifited. For the fame reafon it is properta — 
examine the fhores of rivers, It will be of ufe alfo to take a general view 
ef the country from the tops of towers and of the higheft fteeples. It will 
be of fome importance alfo to enquire, in the country, whether the isha-~ 
bitants make ufe of lime, marl, plafter, coal, earth, or turf-afhes, for ma- 
puriog their land; ang from what places thefe fubftances are procured. C, 
j utility 
