Manchester Memoirs, Vol. lix. (191 5), No. \% 



XII. John Dalton's Lectures and Lecture 

 Illustrations. 



Parts I. and II. 

 By Prof. W. W. Haldane Gee, B.Sc, M.Sc.Tech. 



( Read May nth, 1915. Received for publication July ijtk, 191 5.) 



Introduction. 



During last summer some members of a special com- 

 mittee of the Council of the Manchester Literary and 

 Philosophical Society, whilst preparing a catalogue of the 

 apparatus and other property in the House of the Society, 

 had their attention directed to a roll of diagrams in one 

 of the cupboards. Many of these were annotated with 

 the unmistakable handwriting of John Dalton, and there 

 was evidence that they had been made by him and 

 used in his lectures. After further search, the collec- 

 tion reached 150 in number. They related to Mechanics, 

 Physics, Chemistry, Astronomy and Meteorology. Some of 

 the diagrams were exhibited and explained by Mr. R. L. 

 Taylor and myself at the meeting of the Society on 

 October 6th, \gi\. 



Since many of the diagrams had reference to the 

 Atomic Theory, it was decided to ask Dr. Arthur Harden, 

 who was associated with Sir Henry Roscoe in writing " A 

 New View of the Origin of Dalton's Atomic Theory," to 

 inspect the diagrams. This he did in conjunction with Dr. 

 H. F. Coward and the writer. 



The diagrams have been pressed and cleaned. In a 

 few cases the ink has caused such corrosion that it has 

 been necessary to paste thin transparent paper over the 



September jrd, JQtJ. 



