AmbJcTi8P78arn5'}  Gleanings  from  the  German  Journals.  473 
ment  over  our  previous  efforts  to  make  an  efficient  wine  of  pepsin. 
Whether  protracted  contact  with  alcohol  will  affect  its  properties 
remains  to  be  tested,  as  our  own  experience  has  as  yet  extended  over 
three  or  four  months  only.  With  due  deference  to  the  liberal  spirit  in 
which  Professor  Scheffer  gave  the  world  the  result  of  his  researches  in 
the  field  of  artificial  digestion,  we  here  reiterate  our  disclaimer  of  the 
slightest  intention  of  unfairness  when  we  referred  to  his  standard  pre- 
paration. Of  course,  the  elision  of  the  offending  sentence  will  be  our 
first  care.  Wm.  Procter,  Jr.,  Co. 
Philadelphia,  September,  1878. 
GLEANINGS  FROM  THE  GERMAN  JOURNALS. 
By  Louis  von  Cotzhausen,  Ph.G. 
The  Boiling  Point  of  Sulphuric  Acids  of  Different  Concen- 
tration.— G.  Lunge  published  the  following  table  in  the  "  Ber.  d. 
Deutsch.  Chem.  Ges.,"  1878: 
Per  cent,  of 
Boiling 
Per  cent,  of 
Boiling 
Per  cent,  of 
Boiling 
H2S04. 
Point. 
H2S04. 
Point. 
H2S04. 
Point. 
•;v:;5,  . 
101  °C. 
56 
133  °c. 
80 
207  °C. 
10 
102 
60 
141-5 
82 
218 
103-5 
62*5 
i47 
84 
227 
20 
105 
65 
i53*5 
86 
238-5 
*5 
106*5 
67'5 
161 
88 
251-5 
30 
108 
70 
170 
90 
262-5 
35 
1 10 
72 
i74'5 
9i 
268 
40 
114 
74 
180-5 
92 
274-5 
45 
118-5 
76 
189 
93 
281-5 
50 
124 
78 
199 
94 
288-5 
53 
128-5 
95 
295 
— Pharm.  Centralh.,  June  20,  1878,  p.  226. 
Fleischer's  densimeters  greatly  resemble  ordinary  araeometers  in 
appearance  and  construction,  but  differ  in  having  their  degrees  indicated 
by  the  same  number  which  expresses  the  decimal  portion  of  the  spe- 
cific gravity.  Thus  180  of  the  densimeter  =  1  •  1 8  specific  gravity, 
500  =  1-50,  spec,  grav.,  27J0  =  1*275  spec,  grav.,  21J0  =  1*2125 
spec,  grav.,  etc.  The  normal  temperature  for  the  division  is  i5°C 
The  densimeter  for  pharmaceutical  purposes  is  supplied  with  a  thermo- 
meter.— Ibid.,  p.  228. 
