Am.  Jour.  Pharm. 
June,  19 18. 
Book  Reviews. 
467 
for  export  to  United  States  is  150,000  kin  (198,416  pounds)  each 
month  April,  May,  June,  and  that  apportionment  for  every  three 
months  thereafter  will  be  according  to  production.  (From  Com- 
merce Reports,  April  8,  191 8.) 
Tests  of  American  and  Foreign  Chemical  Glassware. — 
Prior  to  the  summer  of  1914,  the  greater  part  of  the  chemical  labora- 
tory glassware  used  in  this  country  was  imported  from  Germany 
and  Austria.  The  cutting  off  of  imports  from  these  countries  caused 
'  a  very  serious  shortage  of  glassware  in  this  country,  which  is  not 
yet  entirely  overcome.  However,  within  the  past  two  years  a  num- 
ber of  American  manufacturers  have  increased  their  production  of 
such  ware,  or  are  manufacturing  grades  of  chemical  glassware  that 
they  did  not  produce  before.  It  is  probable  that  practically  our 
whole  available  supply  at  this  time  is  of  domestic  manufacture,  much 
of  which  is  ware  sold  under  brand  names  which  were  unknown  a 
short  time  ago. 
In  order  to  furnish  to  chemists  information  regarding  such  do- 
mestic brands,  it  was  decided  by  the  United  States  Bureau  of 
Standards  to  compare  them  with  those  of  foreign  make.  These 
results  of  the  bureau's  tests  indicate  that  all  of  the  American-made 
wares  tested  are  superior  to  Kavalier  and  equal  or  superior  to  Jena 
ware  for  general  chemical  laboratory  use.  Results  of  these  tests 
are  given  in  Technologic  Paper,  No.  107,  "  Comparative  Tests  of 
Chemical  Glassware,"  Superintendent  of  Documents,  Government 
Printing  Office,  for  10  cents.  (From  Commerce  Reports,  April 
16,  1918.) 
BOOK  REVIEWS. 
New  Species  of  Xanthium  and  Solidago. 
Charles  F.  Millspaugh  and  Earl  E.  Sherff,  in  publication  199, 
Field  Museum  of  Natural  History,  Botanical  Series,  vol.  IV,  No.  1, 
give  a  monographic  account  of  five  new  species  of  Xanthium  and 
one  of  Solidago. 
The  writers  find  the  taxonomic  status  of  the  various  species  of 
Xanthium  to  be  very  unsatisfactory  at  the  present  time,  partly  be- 
cause of  the  difficulty  encountered  in  the  past  in  identifying  the 
older  specific  names,  which  in  a  number  of  cases  were  founded 
