3i8  Gleanings  from  the  German  Journals.  {^"j.fnTia^so^™' 
It  is  homologous,  as  far  as  its  empirical  formula  is  concerned,  with 
common  camphor,  but  has  different  properties. 
Analysis  III,  above,  was  made  two  or  three  months  later  than  the 
other  two,  after  the  substance  had  been  standing  in  a  test  tube  corked, 
with  occasional  removal  of  the  cork.  It  will  be  noticed  that  oxidation 
is  very  slow,  if  it  takes  place  at  all,  though  a  faint  tint  of  yellow 
seemed  to  indicate  such  action.  Experiments  have  been  commenced 
with  the  object  of  determining  the  nature  of  these  substances  and  their 
chemical  constitution,  if  possible,  and  I  intend  to  subject  the  reactions 
and  derivatives  of  these  interesting  compounds  to  an  extended  investi- 
gation. As  other  duties,  however,  entirely  occupy  me  at  present,  I 
have  been  compelled  to  postpone  further  investigation  on  this  subject 
■for  some  months.  I  therefore  make  this  preliminary  report  and  take 
the  opportunity  to  reserve  the  ground  for  future  work. — Am.  Chem. 
Jour.^  April,  1880. 
GLEANINGS  FROM  THE  GERMAN  JOURNALS. 
By  Louis  VON  Cotzhausen,  Ph.G. 
Glycerin  Cement  was  first  made  by  Hirzel,  who  recommended  it 
as  an  excellent  cement  for  vessels  containing  benzol,  valatile  oils,  etc. 
Prof.  Th.  Morawski,  who  experimented  with  many  different  formulas, 
found  that  the  best  cement  is  obtained  by  adding  5  cc.  of  glycerin  to 
50  grams  of  litharge  ;  if  more  glycerin  is  used,  the  mass  hardens  more 
slowly  and  does  not  become  as  firm.  By  mixing  5  volumes  of  gly- 
cerin with  2  volumes  of  water  and  using  6  cc.  of  this  mixture  with  50 
grams  litharge  a  cement  is  obtained  which  becomes  quite  hard  in  ten 
minutes,  and  harder  in  two  hours  than  glycerin  cement  made  by  any 
other  formula,  but  it  is  not  as  durable  and  firm  after  standing  two  days 
as. that  made  by  the  first  formula. — Pharm.  Centralb.^  March  11,  1880, 
p.  90.,  from  Dingl.  Journ. 
Lametta,  which,  according  to  Skalmeit,  consists  of  98*93  per  cent, 
of  copper  and  I'oy  per  cent,  of  silver,  is  used  in  China  for  manufactur- 
ing metallic  threads  used  in  garments,  and  in  Germany  for  ornamenting 
Christmas  trees. — Ztschr.  d.  Allg.  Oest.  Jpoth.  Ver..,  March  10,  1880, 
p.  127,  from  GewsrhehLf.  d.  Grossher%.  Hessen. 
Unguentum  contra  favum  capitus  is  a  salicylic  pomade,  recom- 
mended by  Hager  as  an  innocent  cure  of  sore  head  of  children  and  as 
an  exterminator  and  preventive  of  vermin.  It  is  made  by  reducing 
salicylic  acid    lO'D  grams  and  borax  3*3   to  a  fine  powder,  adding 
