2 LOEWENFELD, Contributions to the History of Science. 



I wish here to express my sincere thanks to Mr. Francis 

 Jones, M.Sc, F.R.S.E., F.C.S., who kindly lent me the 

 originals of Pis. III. A and III.B for reproduction, and 

 to Mr. A. Sutton, who provided me with the rare woodcuts, 

 Text-figs. I and 2, referring to Dalton. The other docu- 

 ments are out of my own collection. 



