I9I2] William H. Welker 443 



cation and the subsequent dry heating for an hour at 164° C. can 

 easily be accomplished in two hours from the time the current is 

 turned on. The bath for preliminary desiccation holds 16 tubes. 

 The 164° C. bath can take 34 tubes. There is room in the cover 

 for about 12 more openings. The advantages of two baths, for 

 the two different degrees of temperature, are obvious to all who 

 have endeavored to conduct both the desiccation proces and the 

 decomposition Operations in one bath at the maximum temperature. 

 We are indebted to Dr. Eddy for the photographs of the appa- 

 ratus and for the diagram of the wiring. The electrical regulating 

 panel was constructed for us by the International Instrument Com- 

 pany, Cambridge, Mass. 



