392 Scientific Intelligence. — Mechanical Philosophy. 



copper, each of which was attached to a copper wire. Two nuts of 

 the same metal, sliding upon a vertical glass rod, and to which the 

 two wires were attached, permitted their being brought near togeth- 

 er, or removed at pleasure. Having suspended a prepared frog by 

 the body to the upper wire, the legs were placed upon the lower one. 

 The apparatus being thus arranged, whenever (the discs being re- 

 spectively covered with the red and violet rays) a contact was formed 

 between the extreme parts of the two wires, evident signs of con- 

 tractions were observed in the frog. — Note by Prof. Gazzeri. 



Having experimented two summers since, upon the solar spec- 

 trum, in exactly the same way, except that a very delicate galvan- 

 ometer was used instead of a frog, no electricity could be obtained 

 by means of an English sun. M. F. — Idem. 



5. Leech Bites. — Dr. Lowendhart mentions a method of check- 

 ing the profuse bleeding from leech bites, which is simple and effect- 

 ual. The edges of the little wounds are drawn together with a fine 

 needle and thread. The thread being drawn through the cuticle only, 

 gives no pain, and the bleeding is at once suppressed. (Jour, de 

 Chir. Med. Jour. VI. 86.)— Idem. 



6. Professor Hanstein. — Terrestrial Magnetism. — Letters have 

 been received from Professor Hanstein and his companions, to" the 

 19th of February. On the 12th of September they left Tobolsk, 

 and travelled on sledges, the cold being at —40° R., so that the fro- 

 zen quicksilver could be cut with a knife. On the 31st they arrived 

 at Tomsk; on the 21st of January, 1829, at Krasnojarsk, and on the 

 7th of February, at Irkutsk, which is about 4000 versts from To- 

 bolsk. They afterwards visited Kiachta, and crossed the frontier of 

 China ; but the most agreeable result is, that the desired object of 

 the journey is accomplished, as the observations have proved per- 

 fectly satisfactory, and the magnetic pole is found. Centuries will 

 perhaps elapse before Siberia will be again so thoroughly observed. 

 When the letters were dispatched, it was resolved that the journey 

 should be extended to Nertschink ; from which place Professor Han- 

 stein would return to Krasnojarsk. His companion. Lieutenant Due, 

 was to go alone to Jakutzk, 2700 versts N. E. of Irkutzk, and per- 

 haps proceed down the river Lena to the Frozen Ocean, and they 

 intended to meet again at Jeniseisk in September or October. (New 

 Mon. Mag. XXVII. 359.)— J^em. 



