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% AUG 2] 1923 i, 
ets nisss 
ILLUSTRATED JOURNAL OF SCIENCE 
A WEEKLY 
VOLUME CxI 
JANUARY, 1923, to JUNE, 1923 
“To the solid ground 
Of Nature trusts the mind which builds for aye.” WORDSWORTH. 
London 
MACMILLAN AND CO, Limitep 
NEW YORK: MACMILLAN COMPANY 
— 
