184 



Dr. Buchanan on the Effects of the hAaiUxtion of Ether 



The constituents, therefore, of molybdate of lead, according to this 

 analysis, are, — 



Molybdic acid, 39*19 



Lead protoxide, G0'23 



99-42 



Phosphates and arscniates of lead were decomposed in the same manner; 

 and it is evident this process would also do with antimoniates, vanadiates, 

 and scleniets, &c. 



The two last analyses were made by means of sulphohydret of ammonia ; 

 the three preceding analyses by nitric acid. 



Physiological Effects of the Inhalation of Ether. By Andrew Buchanan, 

 M.D., Professor of the Institutes of Medicine in tlie University of Glasgow. 



(Continued from page 161.) 



The narcotic effects above described do not always follow upon the 

 inhalation of ether. The operation, as at present practised, must be 

 admitted to be uncertain and not devoid of danger. If too little ether 

 be inhaled wc fail in our object of stupifying the nerves; if too much be 

 inhaled, excessive narcotism may be induced; and if atmospheric air be not 

 supplied freely enough, or the same air be respired more than once, there 

 is danger of asphyxia. The source of this uncertainty and danger, is 

 the difficulty of determining the exact quantity of ethereal vapour 

 which is inhaled, and the proportion of air which is mingled with 

 it. To resolve these problems is, therefore, a matter of great 

 importance, and fortunately the solution of them is not difficult. 

 It only requires that the inhaling apparatus be of a proper size and 

 structure, and that it be always employed at the same, and that a fit 

 temperature. The proportion of ether and ethereal vapour is certainly 

 known from the temperature, and if the chamber of the inhaler be of 

 sufficient size that proportion will vary very little during the period of 

 inhalation. If again the apparatus be so constructed, that there is no 

 impediment to the free ingress and egress of the elastic fluid to and from 

 the lungs, the quantity of air, and of course also of ether inhaled in a given 

 time may be determined with considerable accuracy. Now, as the quantity 



* In these analyses the 

 molybdic acid. 



only was ascertained, and the deficiency was taken an 



