44 LETTER-FILES OF S. W. JOHNSON 



Saturday June 25. Worked in Lab. the forenoon. Made 

 some progress on the Chamomile Acids. It is quite certain 

 the Butyric acid is in pretty large quantity. In afternoon 

 went to Brockhaus Buchhandlung. Purchased Liebig's Org. 

 Analysis, Schawz's Maasanalyse and Weber's tables. Ordered 

 Liebig and Kopp's Jahresbericht for 1850 and 1851. Our 

 Wirth brought us Will's Analysis and Erdmann's Lehrbuch. 

 In afternoon had a call from Menzel. 



Monday June 27. Worked in Lab! Free, mixed acids by 

 AgON0 5 for at. wt. detr. Called on Dr. Zenker and took first 

 lesson in German. 



Tuesday. Wrote home. Worked in Lab. Gave Prof, etwas 

 Zucker. Undertook atomic wt. estimation. Blundered all day 

 hunting crucibles, (Royal Porcelain depository was not open) 

 drying and weighing, finally got it nearly finished. 



Wednesday June 29. Finished At. Wts. of Valerianate of 

 Silver. Rec'd letter from Uricoechea. Went out to the 

 Military parade. Bought bathtub. 



Thursday June 30. Analyzed a substance used by the 

 Chinese to procure Kindtodt, found only Fe 2 3 and S0 3 and 

 HO, but no W0 3 , no Ti0 2 as a Belgian chemist had reported. 

 In evening went to concert in Rosenthal. Ordered Huger- 

 shoff' s best balance, got new Spirit Lamp. 



Friday July 1. Rather unsuccessful in preparing xl Malate 

 of Lead from crude Malate of Lime. Dr. Erdmann's Lecture 

 on Pt. Pd. Os. Ir. was very interesting. Spirit Lamp and 

 Iodine distinguished Pd. from Pt. 



Saturday July 2. Dr. Erdmann lectured on Gold. Men- 

 tioned the gilding of the cut section of a platina gilt coin. 

 Was unsuccessful in getting xls of Malate of Lead from the 

 evap. sol. of yesterday. Cleaned platina ware. Procured 

 Alkalimeters of Hugershoff. Weld and I adjudicated our 

 accounts. 



Sunday. Went to Nikolai Kirche in the morning. Walked 

 about town in P.M. Birthday. 



