LIFE AND STUDY IN EUROPE 59 



Halle, with him visited Salt Works (Salinen). Heard the 

 story of the headman, and saw the stages of manufacture, 

 took specimens. Visited Prof. Heintz, found him burning a 

 fatty acid. He showed us pure Palmitic, Stearic, Lauro- 

 Stearic and one other acid, xlzed in scales, and remarked on 

 the general law that mixtures of these in certain proportions 

 gave needles of margaric acid, so called. We looked around 

 his small but busy looking Lab. and left most favorably im- 

 pressed with his kindness and ability. Took leave of Pugh 

 and Young, and 4 P.]\I. found Jacoby in Magdeburg. With 

 him visited the Dome, a splendid old church. Walked about 

 the city till 6 P.M. and left for Potsdam whither we arrived 

 at 10 P.M. We shortly found the Stadt Wittenberg and took 

 lodgings without further adventure. 



March 23. At 2 P.]\I. left for Berlin. Arrived there, we 

 called at Waring 's lodgings, but he was not in. Shortly Prof. 

 Porter overtook us on the street. We settled lodgings at 75 

 Dorothy Street, then walked about town somewhat, called on 

 Prof. Porter, then took supper at a restaurant and shortly 

 turned in. 



March 24. Got out at 8 A.M. and heard Prof. Gustav 

 Rose lecture capitally on RothgUltigerz and Fahlerz. 



Then visited Rammelsberg, calling first at his house where 

 we saw his lady, but found him in shirtsleeves at the Gewerb- 

 schule. He received us very cordially and showed us his 

 Laboratory, including the admirable gas arrangements, the 

 pipettes with glass stop cocks, sulphuretted hydrogen appara- 

 tus, etc. We promised to hospiteer tomorrow and left. We 

 then called on Chapman after dinner, which I took in simple 

 style in the Thier Garten. We then called on Prof. H. Rose 

 who received us in the most friendly manner and invited us 

 to tea on Monday Eve. At 4 P.^I. we surveyed the Frescoes 

 on the ^Museum, then I returned to room and went to Mitscher- 

 lich's Auditorium, but there was no lecture. 



Saturday 25. In morning heard Prof. H. Rose from 9-11 

 on vanadium and chromium. Then spent two hours in the 



