) 
THE CHEMICAL ENGINEER. 
into the work of physical chemistry so as to serve at the same 
time the purpose of treating the chemical side of the industries 
from the theoretical point of view. Of course this cannot well 
include stochiometry which together with the chapter on the 
chemical properties as functions of physical properties, together 
with spectroscopy and allied subjects can with advantage be 
treated separately in conjunction with laboratory work in 
ohysico-chemical measurements. 
Part II.,should be a course treating of the mechanical appliances 
used for the carrying out of various operations such as disinte- 
gration, separation of solid from solid, of liquid from liquid, of 
solid from liquid and so on including the six possibilities, filtra- 
tion, distillation, in short all the operations which are used in 
the manufacturing industries concerned. The point of view 
should be and can readily be one of a higher order than has as 
yet been attempted. There is no reason whatever why the chem- 
ical engineer shall not be aware of the relative stresses on the 
various parts of the machines he uses at least to the extent of 
having an intelligent appreciation of the mutual relation of the 
parts from an engineers point of view so far as a user is concerned, 
or why he shall not have a very clear idea as to the efficiency 
and the scientific principles upon which the efficiency is based 
and measured, or why he shall not be trained in the art of specify- 
ing his wants by means of the language of engineers, whether 
in the form of drawings or specifications as all technical profes- 
sions do. Unfortunately, the chemist is usually, at the outset 
of his career, so utterly untrained in this respect that he becomes 
the victim of many an unscrupulous dealer in machinery or 
huilder of furnaces or other appliances. 
With these two parts properly presented it may be hoped to 
have acquainted the student with the reactions upon which the 
various industries are based and on the other hand the various 
mechanical appliances used to carry them out, and it places him 
in a position to approach Part III. with the necessary training 
and makes it possible to discuss this on a broader basis without 
allowing his attention to be detracted by details of reactions or 
details of appliances. The basis upon which Part III. should 
be treated is essentially economic and should treat essentially