l'Ki:Sll)Ki\ riAI, ADPRFSS SK( TION H. 47 



branch of chemist rv he ctmsidered. The Haber process, upon 

 which (.Jerniany depended for her nitroj^^en supply durinjo; the 

 war, is a technical triumph of physical chemistry. 



Physical Chemistry is, ag^ain, a section so wide, that although 

 in the sense now used it is a product of the last quarter of a 

 century, it is itself rapidly underCToing^ di\ision. The separate 

 science of "radio-activity '' has already split off as a fission- 

 product of very recent o^rowth, but which in the last few years 

 has contributed enonnouslv to basic chemical theorv and an 

 understandinof of the ultimate constitution of matter, and which 

 is rapidlv assuming;- great practical importance. " Metallography *' 

 is a section of physical chemistry which can also be treated as a 

 branch of Metallurgy. It deals with the relation of the micro- 

 structure of metals and their alloys, to their physical properties. 

 It is a very young science, but it is already of enormous industrial 

 importance. One of its recent achievements is the production, 

 for aeroplane purposes, of an alloy which, weight for weight, is 

 more than twice as strong as steel. Other fission-products of 

 physical chemistry are rapidly developing, and it will not be long 

 before " Colloidal Chemistry " attains the dignity of a separate 

 science. 



These three main sections. Inorganic, Organic, and Physical, 

 represent the three primary lines of cleavage of the science of 

 Chemistry. Analytical Chemistry\ though to some extent it is 

 taught as a separate science, and is practised as a separate 

 profession, can hardly be called a distinct section of chemistry, 

 since everv chemist mtist be an analyst, and every analyst entitled 

 to the name must be a sound general chemist with a training in 

 all three sections of his science. 



For Chemistry as a whole the sister science of Physics is 

 absolutely essential, as also a working knowledge of Mathematics. 

 For the higher reaches of Physical Chemistry the investigator 

 must be a mathematician of no mean order. 



These three major branches of chemistry are taught by 

 separate professors in all properly equipped colleges, with sub- 

 sections taught either by separate professors or by specialist 

 lecturers, according to the purpose for which the institution 

 exists, and its financial resources. Thus in the University of 

 Illinois the chemical department proper is organised under seven 

 divisions, with the following stafif: — 



General Chemistry and Qualitative Aualysis. 



I Professor. ?, Instructors. 



I Assistant Professor. 8 Assistants. 



I As.sociate. ig Graduate Assistants. 



Quantitative Analysis and Food Chemistry. 



I Assistant Professor. i Instructor. 



I Associate. 7 Assistants. 



