xii. Proceedings. [January nth, 1921. 



a demonstration of shadows produced by candles and by an arc 

 lamp was given. In conclusion, a flashlight photograph was 

 taken. 



Mr. R. W. James, M.A., described the production of li Liquid 

 Air " at a temperature of 200 degrees Centigrade below the 

 temperature of the atmosphere. He gave demonstrations of its 

 properties, and exhibited the rapid freezing of grapes, an india- 

 rubber ball, and beefsteak, which were then smashed with a 

 hammer. Flowers were placed in liquid air and then crumbled 

 to powder ; and finally mercury was frozen and made into a 

 wire hook strong enough to support a small weight. The 

 fractionation of liquid air on evaporation was proved by suit- 

 able experiments, and the power developed on evaporation was 

 shown by running a small engine charged with liquid air. 



General Meeting, January nth, 1921. 



Mr. Francis Jones, M.Sc, F.R.S.E., F.C.S. {Vice-President), 



in the Chair. 



Dr. John Prescott, M.A., Lecturer in Mathematics in the College of 

 Technology, Manchester, 11/., Granby Road, Cheadle Hulme, Stockport; 

 and Mr. Harold Stevenson, F.I.C., Assoc. Univ. Coll., Nottingham, 

 Works Chemist, The British Dyestuifs Corporation (Clayton), Ltd., 

 6, Cranbourne Road, Heaton Moor, Stockport; were elected Ordinary 

 Members of the Society. 



Ordinary Meeting, January nth, 1921. 



Mr. Francis Jones, M.Sc, F.R.S.E., F.C.S. (Vice-President), 



in the Chair. 



A vote of thanks was passed to the donors of the books upon 

 the table. These included "Annals of Botany/' Vol. 22, pre- 

 sented by Professor F. E. Weiss ; six reprints of Mr. David 

 Brownlie's works on Fuel Economy, presented by the Author; 

 and The Engineer, now being presented to the Society's library, 

 weekly, by Mr. Harold Moore and Dr. W. R. Ormandy. 



Dr. Alfred A. Mumford read a paper entitled " Testing 

 and Grading of Health and Physical Fitness." 



The author pointed out the necessity of having fresh physical 

 fitness tests for school children in addition to those at present 

 in use, because school work imposed a strain which increased 

 as the child grew older. This was particularly evident in the 

 indoor school life of the secondary school child. As dealt with 

 in the medical inspection of schools, health had been mainly 



