372 PHILOSOPHICAL TRANSACTIONS. [anNO 1759. 



XX. Of a Paralytic Patient cured by an Electrical Application, in a Letter 

 from Dr. Himsel, at Riga, to Jacob de Castro Sarmento, M. D., F. R. S, 



Translated from the French, p. 179' 



Dr. H. here states, that a young man aged 20 recovered, by means of elec- 

 tricity, the use of his right arm, which had been affected with palsy for the 

 space of 15 years, all the fingers of the paralytic hand were disabled, and the 

 hand was so bent towards the elbow, as to form a right angle. But after being 

 subjected to electrical shocks and sparks from the 10th of March to the 27th 

 of April, he could extend and contract his fingers at pleasure, could move his 

 arm backwards and forwards, and raise a 40 lb. weight to the height of three 

 feet from the ground. He could also write his name, which he had not been 

 capable of doing for 15 years before. 



XXI. On some Observations relating to the Production of the Terra Tripolitana, 

 or Tripoli. By Martin Hubner, F. R. S. Professor of History in the Uni- 

 versity of Copenhagen, and Member of the Royal Academy of Inscriptions 

 and Belles Lettres of Paris. Translated from the French, by Emanuel 

 Mendes Da Costa, F.R.S. p. 186. 



Mr. H. endeavours to prove that the terra tripolitana or tripoli, is only a 

 wood wholly petrified, and afterwards calcined by subterraneous fire. 



Remarks on the preceding Paper. By Mr. Emanuel Mendes Da Costa, 



F.R.S. p. 192. 



Mr. Da Costa remarks, that it is not improbable but that some of Mr. Hubner's 

 tripoli might have been produced from the petrified wood he found in the moun- 

 tain de Poligne, in Brittany ; and the whole account is then reduced to this only 

 circumstance, that the layers of fossil wood in this mountain, having been satu- 

 rated with the tripoline particles, which likewise abound in the same mountain, 

 thereby composed a stone, or third body ; and that afterwards, these tripoline 

 particles were again reduced, by the effects of a subterraneous fire, to their 

 pristine state ; the force of the fire destroying the compages of the third body, 

 or stone. 



XXII. A Remarkable Case of an Empyema. By Mr. Joseph Warner, F. R. S., 



and Surgean to Guy^s Hospital, p. 194. 



May be consulted in the collection of this author's surgical works. 



XXHI. Extracts of some Letters from Signer Abbate de Fenuti, F. R. S. to J. 

 Nixon, A. M. and F.R.S., relating to several Antiquities lately discovered in 

 Italy, p. 201. 



[In these letters there is nothing sufficiently interesting for republication ot 

 abridgement.] 



