636  Book  Reviews.  {  Am' slpY '  19^™" 
to  be  "used  as  a  pigment."  On  pages  10  and  14,  Cerium  and 
Thorium,  respectively  (instead  of  their  oxides),  are  said  to  be 
"  used  for  incandescent  gas  mantles."  On  page  42,  liquid  air  is  said 
to  be  separated  "  by  distilling  off  first  the  oxygen,  then  the  nitrogen, '* 
when  the  reverse  is  the  proper  procedure,  the  author  apparently 
overlooked  the  fact  that  nitrogen,  which  he  says  boils  at  — 194 0  C, 
is  more  volatile  than  oxygen,  the  boiling  point  of  which  he  gives  as 
— 1820  C.  On  page  70,  alcohol  is  said  to  be  "a  grand  solvent  for 
dissolving  gums  "  and  "  it  is  an  excellent  disinfectant."  Page  89 
contains  a  statement  with  reference,  to  the  reaction  which  ensues 
when  calcium  phosphide  and  water  are  mixed  which  does  not  agree 
with  general  observations. 
F.  P.  Stroup. 
