146 HERMANN VON HELMHOLTZ 



reconverted into any other form of energy, had been briefly 

 discussed by Helmholtz in the report, while he indicates the 

 conclusions which follow from the considerations laid down by 

 Thomson, and which he himself had developed so brilliantly 

 in his lecture on ' The Interaction of Natural Forces '. 



In the middle of September Helmholtz fetched his family 

 from Dahlem, and settled them at Bonn, the move being ac- 

 complished without difficulty, as his wife was in fairly good 

 health. 



