AtoMay ri9i5aim' }    Some  Studies  on  the  Oxy-pinenes.  199 
the  central  orifice,  which  is  10  millimetres  in  diameter  and  is  fitted 
with  a  plunger  actuated  by  a  micrometer  screw,  the  top  against 
which  the  cutting  is  done  being  fitted  with  a  hard  steel  surface. 
In  use  a  half  cylinder  of  supporting  material  is  placed  in  each 
side  of  the  body  and  the  hinge  closed  with  the  specimen  between ;  it 
is  then  clamped  with  a  swing  bolt. 
A  new  hand  microtome. 
In  the  case  of  a  leaf  or  a  delicate  bark  the  best  supporting  material 
is  found  to  be  ivory  soap;  with  thicker  bark  or  roots  elder  pith  is 
preferable,  while  cork  is  resorted  to  only  when  very  refractory 
material  is  encountered.  An  ordinary  razor  is  used  to  make  the 
sections,  using  a  drawing  cut  and  pressing  the  razor  firmly  against 
the  steel  plate.  The  micrometer  screw  is  fed  forward  between  each 
cut  by  an  amount  determined  by  trial,  but  rarely  less  than  0.002  inch. 
SOME  STUDIES  ON  THE  OXY-PINENES. 
By  J.  Emile  Blomen,  A.M.,  Ph.D. 
.  Historical. 
In  the  Medical  Record  of  February  13,  191 5  (also  this  Journal, 
April,  1915),  appears  an  article  by  Dr.  Bertram  H.  Waters  relating  to 
the  use  of  ozonide  of  pinene  vapors  in  the  treatment  of  pulmonary 
diseases.    As  very  little  is  to  be  found  in  ordinary  text-boks  in 
