152  Reviews.  { A  ViS.  ?9o?.r  ^ 
The  contents  of  the  second  volume  include: 
Part  I.  General  Principles  and  Methods  Applicable  in  the  Pro- 
duction of  Inorganic  Chemical  Preparations:  (i)  Choice  of  Methods 
and  Materials;  (2)  Crushing  and  Powdering;  (3)  Dry  Chemical 
Processes;  (4)  Solution :  Its  Nature,  Causes  and  Effects;  (5)  Sol- 
vents, Solubility,  Solutions ;  (6)  The  Clarification  of  Liquids^ 
Strainers,  Presses,  Filtration  ;  (7)  Evaporation ;  (8)  Distillation  ;  (9) 
Crystals  and  Crystallization;  (10)  Crystallizations  from  Solutions ; 
(11)  Dialysis;  (12)  Precipitation;  (13)  Chemical  Solution,  Wet 
Oxidation,  Wet  Gas  Operations;  (14)  Uses  of  Unfinished  Products; 
Purification  of  Crude  Chemicals.  What  to  do  with  Damaged  Pro- 
ducts. Profitable  Chemical  Work;  (15)  The  Preservation  of  Medi- 
cinal Substances;  (16)  Solubilities  of  Chemical  Compounds  in 
Water  and  in  Alcohol ;  (17)  The  Densities  of  Solids  and  Liquids. 
The  Mohr.Westphal  Balance  ;  Hydrometers ;  Pycnometers,  etc. ; 
(1 8)  Rules  for  Making  Solutions  of  any  Given  Strength,  and  for 
Diluting,  Fortifying  and  Mixing;  (19)  Laboratory  Furniture  and 
Apparatus ;  (20)  Laboratory  Rules  and  Precautions ;  What  to  do- 
in  Accidents ;  How  to  Clean  Apparatus.  Part  II.  Laboratory 
Manual  of  Inorganic  Chemical  Preparations:  Introductory;  Weights 
and  Measures;  Water;  Acids;  Other  Preparations ;  Tables;  Index. 
The  chapters  on  Chemical  Polarity,  Atomic  Valence  and  Atomic 
Polarity- Value,  in  Book  I,  are  particularly  valuable.  The  applica- 
tion of  atomic  valence  in  balancing  equations  is  of  great  value,  par- 
ticularly in  the  consideration  of  oxidation  equations.  It  is  doubtful 
if  there  are  any  formulae  or  reactions  which  are  not  in  agreement 
with  the  doctrine  that  no  atom  can  gain  increased  combining  value 
except  at  the  expense  of  some  other  atom  or  atoms  and  that  the 
gain  and  the  loss  exactly  balance  each  other.  The  consideration 
of  the  nature  of  atoms  underlies  the  whole  superstructure  of  prac- 
tical chemistry.  Part  I  is  based  on  the  most  advanced  chemical 
theories,  and  the  author  has  wisely  devoted  over  300  pages  in  the 
consideration  of  the  fundamental  matters  connected  with  theoretical 
chemistry.  The  remainder  of  Part  I  is  given  to  the  consideration 
of  the  elements  and  the  stoechiometry  of  inorganic  chemistry. 
Volume  II  is  devoted  to  the  consideration  of  actual  laboratory 
operations  in  the  production  of  inorganic  chemicals  and  the  making 
of  500  inorganic  chemical  preparations.  The  author  has  shown  an 
assimilation  of  the  subject  matter  and  an  originality  of  treatment 
