Am6iober,Pi898rm-}    Meetings  of  the  Board  of  Trustees.  533 
wings  are  in  rapid  motion.  The  sinuous  margin  being  of  less  importance, 
comparatively,  for  the  male,  we  can  understand  its  greater  variability  in  the 
sex  where  it  is  less  rigidly  selected. 
Occurrence  of  Native  Copper  at  Franklin  Furnace,  New  Jersey. 
By  J.  E.  Wolff. 
The  occurrence  of  native  copper  here  increases  the  long  list  of  minerals 
found  at  Franklin  furnace  and  vicinity  (now  nearly  seventy)  and  is  an  in- 
teresting addition  to  the  occurrence  of  native  copper  below  the  zone  of  sur- 
face oxidation. 
Exhibition  and  Preliminary  Account  of  a  Collection  of  Micro- 
photographs  of  Snow  Crystals,  made  by  W.  A.  Bentley.  By  J.  E. 
Wolff. 
The  same  general  types  of  crystals  noticed  by  previous  observers  recur 
here,  such  as  the  star  form,  star  form  with  solid  nucleus  and  tabular  form, 
while  the  columnar  form  (hexagonal  prism  and  base)  is  rare  and  the  hex- 
agonal pyramid  is  not  seen .  Mr.  Bentley  confirms  the  previous  observations, 
that  the  large  stellate  crystals  are  more  common  at  the  higher  temperatures 
and  the  tabular  ones  at  the  lower. 
An  Inquiry  into  the  Nature  of  Electrical  Discharges  in  Air  and 
Gases.    By  John  Trowbridge. 
According  to  the  author,  beyond  i,oco,ooo  volts  the  initial  resistance  of  at- 
mospheric air  to  electrical  discharges  becomes  less  and  less,  and,  in  certain  con- 
ditions, can  be  as  low  as  i,oco  ohms  between  terminals  two  or  three  metres 
apart. 
Revision  of  the  Mexican  and  Central  American  Species  of  Gaeium 
and  Relbanium.    By  J.  M.  Greenman. 
Diagnoses  of  New  and  Critical  Mexican  Phanerogams.  By  J.  M. 
Greenman. 
Both  of  these  papers  by  Dr.  Greenman  are  of  a  systematic  nature,  and  are 
contributions  from  the  Gray  Herbarium  of  Harvard  University. 
Notes  on  the  Projective  Group.    By  E.  W.  Rettger. 
The  author  finds  that  a  number  of  the  sub-groups  of  the  projective  group 
in  two  or  three  variables  are  not  properly  continuous  except  in  the  neighbor- 
hood of  the  identical  transformation. 
MEETINGS  OF  THE  BOARD  OF  TRUSTEES. 
A  special  meeting  of  the  Board  of  Trustees  was  held  on  August  26,  1S98,  by 
the  direction  of  the  President  of  the  College,  to  take  action  relative  to  the  death 
of  Professor  Henry  Trimble,  who  died  at  noon  on  the  24th  day  of  August. 
W.  J.  Jenks  was  made  the  Chairman  pro  tern.,  and  announced  in  a  few  words 
the  object  of  the  meeting  and  loss  the  College  had  sustained.  The  various  mem- 
bers present  gave  personal  attestation  of  their  appreciation  of  Professor  Trimble, 
of  his  devotion  to  duty,  his  untiring  industry,  his  steadfast  friendship  and  loyalty 
to  the  interests  of  the  College.  A  committee,  consisting  of  Jos.  P.  Remington, 
Chas.  Bullock  and  Jos.  W.  England,  were  appointed  to  draft  resolutions  expres- 
