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consequently of crude Zro.  In the first place the adventure  was 
expensive.  It was uneconomical (in the scientific sense) to send 
ships with less than 1000 fighting men. The Zro required for these 
meant  the employment of at least 7000 serviles,  and  the  naval 
construction  was  therefore of a colossal  order.  But  although 
little  difficulty  was  found in conquering the country  in  the 
military sense,  the natives had to be almost  exterminated,  and 
the  labour of the survivors proved difficult to enforce.  It was 
even  then  not a tenth as efficient as that of the  serviles  at 
home.  The imported serviles moreover caught native diseases, and 
died  in hundreds;  and though by prodigious sacrifices the  West 
African Empire was kept going for nearly 200 years, it had to end 
at last no less ingloriously than the French adventure in Mexico, 
or the English in India, and South Africa.*
   The main causes were the impossibility of breeding children in 
a climate so unsuitable, even of maintaining their own women, and 
above  all the fact that the crude Zro was not of a quality equal 
to  that  obtained in Atlas,  and that the Zro generated  by  the 
Atlanteans themselves was not to be made at all outside their own 
country.  The lesson was learnt. Until the end no further attempt 
was  made  to advance in any but the true  direction.  The  great 
majority   of  the  colonists  returned  to  Atlas;   but   many, 
degenerating as is the fashion with colonists of this  conquering 
kind,  abandoned  Zro  for  gross  food,  intermarried  with  the 
natives,  and  have  generally degenerated yet further  to  races 
inferior  even  to the present descendants of those who  were  in 
those days the equivalents of the serviles of Atlas.
.pa
                               IX.
                       OF THE CATASTROPHE,
                       ITS ANTECEDENTS AND
                        PRESUMED CAUSES.
   In  my  remarks on Zro I have a necessarily  somewhat  diffuse 
account of the properties of this remarkable substance.  It  must 
now  be  made  clearer  that the crude Zro  in  its  nine  stages 
produced  by the serviles,  and consumed in the 'houses'  was  in 
each  stage  of  inferior  quality to that  of  the  same  degree 
produced by the Atlanteans,  and consumed by the High House.  For 
example,  the  crude Zro was made in a labour-mill with all sorts 
of insulations.  The first stage of the priest's Zro could be made 
anywhere  and at any time,  and naturally directed itself to  the 
receptable for it without any precautions.  It must,  I think, be 
presumed  that the Zro generated in the High House was  again  of 
far  greater  purity  and potency.  Very little of  it  can  have 
been  used  in  the  experiments of  the  magicians,  and  it  is 
therefore necessary to account for enormous quantities,  produced 
during many centuries of uninterrupted labour.  I have,  however, 
no data of any kind for this investigation;  the mysteries of the 
High  House  have  ever been inscrutable,  and  were  not  wholly 
delivered to the Heirs of Atlas. They must be rediscovered by the 
magicians  of the new race.  It may be that in some form or other 
the Zro had been made stable,  and used to impregnate the  column 
which  is  alleged  to  have been  driven  'through  the  Earth'; 
perhaps,  and less improbably, only to the depth of a few hundred 
miles.  This column, however long it may have been, had certainly 
its  top immediately beneath the reservoir of the High House.  It