130 PROCEEDINGS OF THE AMERICAN ACADEMY 



Although the apparatus here described and figured was invented 

 independently by myself in order to overcome difficulties, already 

 stated, which I met with in the course of my investigations, yet in its 

 main features I was anticipated by Professor H. Carmichael,now of Bow- 

 doin College ; and I had the misfortune not to have my attention called 

 to his paper on the subject — dated at Gottingen, 1870, and published 

 in the Zeitsclirift fur Chemie, neue Folge, Band VI., 481 — until long 

 after my own apparatus had been perfected. But although Professor 

 Carmichael and myself started from the same fundamental idea, yet we 

 have worked this idea out in very different forms, and with very differ- 

 ent purposes in view. While therefore I would acknowledge most 

 fully Professor Carmichael's priority, I have thought it best to publish 

 this paper with the sole object of adding to his previous work the 

 results of my own experience, and with the hope that I may thus aid 

 in introducing into analytical laboratories what I believe to be the 

 most important improvement in analytical chemistry which has been 

 made since the invention of the Bunsen pump. 



Chemical Laboratory of Harvard College, 1876. 



