[ 358 ] 



LXIII. Copy of a Letter from Mr. Cuthbertson to Dr, 

 Pearson, communicating an i7nportant and curious dis- 

 tinguishing Property between the Galvanic and Electric 



Fluids*. 



I 



DEAR SIR, 



THINK it right to inform you, that yesterday evening T 

 resumed the experiments with the Galvanic batteries. The 

 result was : 



1. Charcoal was deflagrated and ignited for above an inch 

 in length. 



2. Iron wire, l-40th inch diameter, was melted into a ball 

 1-I6th inch diameter. 



3. Platina wire, 1- 100th inch diameter, was melted into a 

 ball 1-lOth inch diameter. 



4. Brass wire, l-20th inch diameter, 3-4th inch in length, 

 was ignited. 



5. Brass wire, l-l6th inch diameter, was red hot at the end. 



6. Iron vi'ire, 1-1 50th inch diameter, was red hot for 

 sixteen inches in length. 



7. Iron wire, twelve inches, deflagrated, and melted into 

 a ball. 



8. Iron wire, six inches in length, was deflagrated. 



9. Iron wire, eight inches in length, was ignited. 



Two troughs, each trough containing thirty pairs of plates 

 six inches square, were vised for the first seven experimentg, 

 and one of these troughs only for the two last experiments. 



The four last experimenis prove, I think, that double 

 quantities of Galvanic fluid only burn double lengths of 

 wire, and not the square, as electrical discharges do. 

 I am with the greatest respect, sir, 

 Your very humble servant, 



Poland-street, Soho, JoHN CuTHBERTSOV, 



27th March, 1804.. 



LXIV. Proceedings of Learned Societies. 



ROYAL SOCIETY OF GOTTINGEN. 



J. HE physical class has proposed the following prize ques- 

 tion for the month of November, 1 805 : 



Quum physiologi de vasculoso vegetabilium contextu di- 

 versa prorsus statuant, aliis, iisque antiquioribus, ilium ad- 



* Communicated by Dr. Pearson. 



serentibus. 



