I Q2 CHEMICAI, GERMAN 



Page 81. i. Luft, this name was applied to all gases as well as to air. 

 2. Schwefelsaures Gas, sulphurous anhydride. 



Page 82. i. schwefelhaltiges Wasserstoffgas, hydrogen sulphide. 



Page 83. i. Johann W. Dobereiner (1780-1849). Professor of Chemistry 

 in Jena. Famous for his work upon the triads, which 

 was important later in connection with the development 

 of the periodic law. Berzelius' atomic weights, cited in 

 this article, are remarkable for their close agreement 

 with more recent determinations. Berzelius used oxygen 

 as his standard, assigning it the value 100. Dobereiner 

 in his article uses sometimes the hydrogen (= i ) stand- 

 ard and at other times the oxygen ( 100) standard. 



Page 84. i. Isomorphologie, for Isomorphisms. 



Page 86. i. Owing to wrong assumptions at to atomic weights of cer- 

 tain elements the symbols of their oxides were different 

 from those now in use. 



2. Cerarium, a name proposed originally for the metal now 

 called cerium. 



Page 87. I. Pluran was the name proposed by Osann in 1828 for a sup- 

 posed new metal which was later called Ruthenium by 

 Claus, who completed the discovery in 1845 ; the name was 

 derived from platinum and Ural. 



2. Platinum and iridium were supposed to have the same 

 atomic weight. 



Page 88. i. Berzelius' method for the determination oif carbon in iron 

 and steel formed the basis for the common practice in 

 iron and steel works throughout the world. 

 2. Sicherheitshalber, for the sake of safety. 



Page 89. i. schwefelgebundener Wasserstoff, an old form for Schwefel- 

 wasserstoff, hydrogen sulphide. 



Page 91. 



Page 97- 



Page 98. 



Page 99. 



Page loo. 



Page ioi. 



Page 103. 



Page 104. 



Page 105. 



Kiesel, silicium. 



an den Tag zu legen, to make clear, to explain. 



Cremor Tartari, cream of tartar. 



mir zu Gebote stand, stood at my disposal. 



schmelzt, an old form for schmilzt. 



. Blumen, in allusion to flowers of sulphur. 



geschmelztem, for geschmolzenem. 



auf trockenem Weg, in the dry way. 



Leichtfliissigkeit, fusibility. 



Torbern Bergmann, (1735-1784), Professor of Chemistry in 



Upsala. 



2. Johann Gottlieb Gahn (1745-1818), Mining Engineer in 



Stockholm. 



3. auf nassem Wege, in the wet way. 



