]irof. Dr. Ferdi. n a n d Fischer. B r a u n s c h w e i g : X'ieveg u. Sohn. I>0(J. lq-eis, 5 ink. The part above entitled of this s t a n d a r d publication relates specifically to the chemical technology of fuels. The suloject is introduced by a general consideration of the thermo-chemistrv of fuels, fl-om which their thermal value must be calculated. Following this, come chapters on the chemical a n d physical properties of 'k "t , iJC:t', t ! ?ii _!;i ' '':!, ' i : : i,!)i{: ~ : i,i:Lt;l t{L; L ' , ! ; , <', .AC~t.i.-,L{C.&idata a n d elaborate tables, giving the constituents a n d fuel value of m a n y of the E u r o p e a n a n d A m e r i c a n coals. T h e part concludes with chapters on the formation of c o a I a n d t h e s p o n . taneous comhustion of coal. T h e chemical engineer, famiIiar with the literature of his subject, will need no introduction to this thorough a n d c o m p r e h e n s i v e h a u d h o o k , which ranks second in value to none in its special field. W.