OFFICIAI, INSPECTION iq. 



151 



SPIRIT OF NITROUS ETHRR. 

 June 3, 1909, there was made up from a Smith, KHne & 

 French Company's tube of concentrated nitrous ether about one 

 pmt of sweet spirit of nitre. Care was taken to follow exactly 

 the dn-ections upon the tube. As soon as prepared this was 

 analyzed and found to carry 4.06 per cent ethyl nitrite or equal 

 to 101.5 per cent U. S. P. standard. This was, in accordance 

 with the directions in Official Inspections 3, stored in an amber 

 bottle, stoppered with a cork stopper and kept in the dark in a 

 refrigerator. At intervals during three months samples were 

 drawn and tested. Each time a test was made about two 

 ounces were poured out and thrown away in imitation of a sale 

 of that amount. The bottle was full when the test began and 

 was about half empty at the end of 90 days. The results were 

 as follows : 



fable shm.'iug changes in composition of properly stored sweet 

 ^P^ ^^^ ofji^ ejested^atmtervals during three months. 



1909. 

 June 3 'Made and tested. . . 

 June leiTested '.., 



[Two ounces poured out. 

 July ITjTested 



Two ounces poured out. 



Tested 



Two ounces poured out. 



Tested 



Two ounces poured out. 



Tested 



Aueust 3 

 August IS 

 Sept. 1 



„ , Per cent 

 Ethyl U. S. P. 

 nitrite. st-andard. 



Days 



kept. 



/o 

 4.06 

 4.06 



101.5 

 101.5 





 13 



4.06 



101.5 



44 



4.06 



101.5 



61 



3.97 



99.3 



76 



3.83 



95.8 



90 



It will be seen that under conditions that can be readily 

 imitated in any drug store sweet spirit of nitre may, even in 

 summer, be kept perfectly for 60 days, and in good condition for 

 90 days. // stveet spirit of nitre is prepared and kept in accord- 

 ance zvith the directions in Official Inspections 3 it zvill be of 

 perfect strength zuhen dispensed. 



