JVotes  on  a iJisease  of  Cucumbers. 
271 
cells  have  never  given  out  sprouts  in  my  cultivations.  After 
twelve  hours  the  mycelium  is  visible  to  the  naked  eye.  As 
stated  above,  the  brown  colour  appears  after  twenty-four 
hours,  when  the  first  spores  are  formed. 
' It  is  easy  to  imagine  the  power  of  dissemination  possessed 
hy  an  organism  of  this  nature  and  the  damage  which  it  may 
cause  under  favourable  conditions  of  warm  and  windy 
weather. 
As  a remedy  we  can  recommend  only  the  use  of  neutral 
salts  of  co2)per,  such  as  sulphate  of  copper,  sufficiently  diluted, 
so  as  not  to  burn  the  leaves.  The  best  preventive  measure  is 
to  burn  all  vegetal)le  debris  remaining  after  cultivation,  and  to 
turn  up  the  soil  in  order  to  bury  the  spores  disseminated  on  its 
surface. 
P.  Maze. 
Pasteur  Institute,  Paris. 
Fig.  3. — Disease  of  Cucumbers. 
1.  The  fruit  attacked  by  Cori/?iespora  Mazei,  Giissow,  § natural  size. 
2.  The  fungus,  magnified  22a  times. 
3.  Spore.s  various  forms,  magnified  280  times. 
4.  .\ttacliment  of  the  spore  to  the  conidiophore,  magnified  .nOO  times. 
5.  .ittiichment  of  the  spores  to  each  other,  magnified  500  times. 
