Photo: Rischgitz Collection. 



MENDELEEFF 



The celebrated Russian chemist (1834-1907), whose name 

 will be always associated with the establishment of the Periodic 

 Law. disclosing the relationships of the chemical elements. He 

 greatly enriched the whole science of chemistry, especially 

 where it joins hands with physics. 



Photo: Russell & Sons, Southsea. 

 THE LATE PROFESSOR SIR WILLIAM RAMSAY, K.C.B. 



One of the most distinguished of modern chemists, especially 

 in the department of Physical Chemistry. He isolated Argon, 

 Helium, and three other inert gases from the air, and conducted 

 some remarkable experiments in connection with radio-active 

 elements. No man since Davy has made in chemistry dis- 

 coveries of such a fundamental and far-reaching character. 



