316 Gun Lock, — Hi/d.rophobia,—-Death ofGehlen. 



substituted for the muriatic acid, and the soda is substituted for 

 the ether, and the two displaced bodies unite with each other. 

 The ether obtained is liquid, and therefore hydrated ; but with 

 the help of calcined muriate of lime, we may constitute it in 

 part in the state of gas, which nevertheless is not entirely ex- 

 empt from water, since its decomposition in a red-hot tube gives 

 muriatic acid gas : it also gives carbon allied to a combustible 

 which is probably the acidifiable radical of the muriatic acid, 

 since, being burnt in dry oxygen gas, it is converted into car- 

 bonic acid gas and into muriatic acid gas," 

 [To be coiuiiiucd.l 



To Mr. Tillock. 



Sir, — As I have no doubt but that most of your scientific 

 readers understand the principles of a common gun-lock, I should 

 feel much indebted to any of them, if they would favour me with 

 a general expression of the curve necessary for the construction 

 of the hammer, so that the flint may meet with an equal re-. 

 sistance in every point of the curve ; likewise allowing the cock 

 and hammer to be urged by constant forces (in every position of 

 them) by their respective springs : the rest of the data, I believe^ 

 will be readily perceived from the construction of the lock. 

 I am, sir. 



Your obliged and humble servant, 



Oct. 12, 1815. RusTicus^ 



HYDROPHOBIA. 



Professor Hufeland of Berlin has announced in his Journal, 

 that bleeding in cases of hydrophobia (first brought before the 

 European practitioners by an article from the East Indies pub-. 

 lished in The Philosophical Magazine) has met with equal suc>! 

 cess in Germany as in India. He intends to publish some of 

 the cases forthwith. 



We lament to have to announce the death of Gehlen, many 

 years the Editor of an excellent Journal on Chemistry and other 

 sciences, and a profound chemist. He fell a victim to his ar-i 

 dent desire to promote the advancement of chemical knowledge. 

 He was preparing, in company with his colleague Mr. Rehland, 

 some arsciiated livdrogenic gas; and whilst watching for the 

 full development of this air from its acid solution, trying at every 

 moment to judge, from its particular smell, when that operation 

 would be completed, he inhaled the fatal poison which has rob 

 bed science of his valuable services. 



GAS 



