ON  THE  PEAK  OE  TENEEIEFE. 
531 
From  this  Table  then  we  may  gather,  that  while  the  epochs  of  minimum  temperature 
for  the  three  places  are  nearly  normal,  viz.  January  20,  February  5,  and  February  1,  the 
times  of  maximum  are  October  12,  September  5,  and  August  18;  all  of  them  too  late, 
and  Las  Palmas  most  notably  so.  Their  mean  temperatures,  however,  do  not  differ 
much,  and  Las  Palmas,  it  is  worthy  of  remark,  is  not  the  highest  of  them ; but  their 
differences  of  semi-annual  extremes,  or22°T3, 16°‘25,  and  14°’ 9 7,  are  extremely  discord- 
ant, and  increase  continually  with  an  expressive  “ continental  ” character,  so  to  speak, 
or  in  remarkable  accordance  with  the  actual  retardation  of  their  summer  waves  of  heat ; 
a circumstance  which  would  have  been  exactly  reversed,  if  the  drag  had  resulted  from 
the  presence  of  proportionate  depths  of  badly  conducting  matter,  as  with  earth-thermo- 
meters. 
