Am.  Jour.  Pharm. ) 
January,  1920.  ) 
Book  Reviews. 
65 
Studies  in  the  Physioi^ogy  of  the  Fungi.  VIII.  Mixed 
Cultures.  By  S.  M.  Zeller  and  Henry  Schmitz. — The  authors  dis- 
cusss  the  behavior  of  the  following  fungi  in  mixed  cultures:  Len- 
zites  vialis,  Merulius  pinastri,  Daedalea  quercina,  Trametes  Peckiiy 
Pleurotus  sapidus,  Merulius  lacrymans,  Lentinus  lepideus,  Daedalia 
confragosa,  Coniophora  cerebella,  Polystictus  versicolor,  Isaria  sp., 
Polyporus  lucidus,  Polystictus  hirsutus,  Aspergillus  glaucus,  A.  niger, 
A.  Jumigatus,  A.  versicolor  and  A.  Sydoud.  A  number  of  combina- 
tions were  used  and  the  results  indicated  in  two  tables.  A  plate  of 
12  figures,  illustrating  the  nature  of  combination  growths  in  culture 
media  accompanies  the  article. 
Studies  in  the  Physioi^ogy  oi^  the  Fungi.  IX.  Enzyme 
Action  in  Armillaria  Mellea  Vahl,  Daedalia  Confragosa  (Bolt. 
Fr.,  and  Polyporus  Lucidus  (Leys.)  Fr.  By  Henry  Schmitz  and 
Sanford  M.  ZeUer. — In  this  article  the  authors  discuss  the  enzyme 
activities  of  the  fungi  indicated.  In  Polyporus  lucidus  the  presence 
of  the  following  enzymes  is  demonstrated:  Esterase,  maltase,  lac- 
tase, sucrase,  raffinase,  diastase,  inulase,  ^  cellulase,  hemicellulase, 
emulsin,  tannase,  urease,  and  trypsin  and  erepsin,  when  fibrin  is 
used  as  a  substrate. 
In  Armillaria  mellea  the  presence  of  the  following  enzymes  is 
shown:  Maltase,  lactase,  sucrase,  raffinase,  diastase,  inulase, 
cellulase,  hemicellulase,  emulsin,  urease,  amidase,  and  trypsin  and 
erepsin,  when  fibrin  is  used  as  a  substrate. 
In  Daedalia  confragosa  the  following  ferments  are  present:  Es- 
terase, maltase,  lactase,  sucrase,  raffinase,  diastase,  inulase,  cellulase, 
hemicellulase,  emulsin,  tannase,  urease,  and  trypsin  and  erepsin, 
when  fibrin  is  used  as  a  substrate. 
A  new  method  for  the  determination  of  ammonia  liberated  by 
amidase  is  described. 
Studies  in  the  Physiology  of  the  Fungi.  X.  Germination 
OF  THE  Spores  of  Certain  Fungi  in  Relation  to  Hydrogen 
Ion  Concentration.  By  R.  W.  Webb. — The  author  reviews  the 
literature  bearing  on  this  problem  and  then  discusses  the  methods 
he  followed  in  determining  the  effect  of  hydrogen  ion  concentration 
upon  the  rate  of  germination  of  the  spores  of  certain  fungi  and  the 
range  within  which  most  favorable  germination  occurs.  He  draws 
the  following  conclusions: 
(i)  In  a  culture  solution  consisting  of  M/5  mannite,  phosphoric 
