380 PELTIER ON THE CAUSES OF THE 
to the inconvenience of requiring a continued unintermitting 
propagation, and their sensibility is very inferior to that of the 
static electrometers, as I have proved in a memoir published in 
the Annales de Chimie et de Physique, t. Ixvii. p. 422. 
These preliminary indications were necessary before entering 
upon the subject of this memoir, ‘The cause of the Electric 
Phznomena of the Atmosphere, and of the Means of inks 
their Manifestations.’ 
Cuaprer I. 
Of the Means of ascertaining the Resinous Induction of 
the Earth. 
9. De Saussure* refers the first analogy made between elec- 
tricity and lightning to Gilbert, a view which Wallt reproduced 
in 1708, Grey in 1735 f, Nollet in 1746§, Hales || and Barberet 4 
about the same time; and lastly, Franklin and his successors. 
Franklin had only indicated the means of investigation, but 
he had not yet made’ any experiment, when D’Alibard** made 
his at Marly-la-Ville the 10th of May 1752, with a fixed appa- 
ratus, and Romast+t in the same year with a paper kite. The 
number of the fixed apparatus increased, being more convenient 
than the moveable ones. Beccariat{, Le Monnier$§$, Ronayne||||, 
Read 44], Schubler***, &c. made use of fixed apparatus; whilst — 
Romas, the Prince Gallitzin, Mussenbrock+++, Van Swinden, — 
the Duke of Chaulnes, Bertholon{{{, Beccaria, Franklin $$$, 
and Cavallo ||||||, jommed the paper kites to the fixed apparatus. 
* Voyage dans les Alpes. Note du § 648 A. 
+ Phil. Trans., vol. xxvi. No. 314, year 1708. 
+ Phil. Trans. abr. vol. viii. p. 401. 
§ Lecons de Physique, 1*¢ édit. du 4° vol. p. 314, year 1748. 
\| Considerations on the Physical Cause of Earthquakes. 
{ Dissertation sur le rapport qui se trouve entre les Phénoménes du Ton- 
nerre et ceux de l’Electricité. Bordeaux, 1750. 
** Traduct. des Lettres de Franklin, by D’Alibard, 2¢ édit. ii. 99, and 
that of Sarbon Duboury, 1'¢ part, 105. 
tt Mem. Sav. Etr. t. ii, ann. 1755, p. 393. 
+ First Letter on Atmospheric Electricity. Turin, 1775. 
8§ Mém. Ac. Se. 1752. 233. 
{| Phil. Trans. 1772, p. 137. 
qq Id. 1791, 185; 1792, 225. 
*** See his Météorologie and the Journal of S. X. B. Weigger, viii. 131 ; 
xi. 337; xix. 1. 
+tt Hota Acad. imperat. Petropol. 1778. Ist part, p. 76 of the history. 
ttt Electricité des Météores de Bertholon, 1 CC. 
5 Franklin’s Works, Letter of the 19th Oct. 1752. 
\\\l| Treatise on Electricity, 4th part, ch. ] and 2. 
