invalid use of template-name 'Array' without an argument(compile error, plz help)

#ifndef Array_H
#define Array_H

template < class elemType >
class Array {
public:
  // parameterize element type
  explicit Array( int size = DefaultArraySize );
  Array( elemType *array, int array_size );
  Array( const Array &rhs );

  virtual ~Array() { delete [] ia; }

  bool operator==( const Array& ) const;
  bool operator!=( const Array& ) const;

  Array& operator=( const Array& );
  int size() const { return _size; }

  virtual elemType& operator[](int index){ return ia[index]; }
  virtual void sort();

  virtual elemType min() const;
  virtual elemType max() const;
  virtual int find( const elemType &value ) const;

protected:
   static const int DefaultArraySize = 12;

   int _size;
   elemType *ia;
};

#endif
---------------------------------------------------------------------------=
-----------------------------------
// Array.cpp

#include "Array.h"

/*
Array::Array(elemType *iarray, int iarray_size)
{
  ia = iarray;
  _size = iarray_size;
}
*/

Array::Array(const Array &rhs )
{
  ia = rhs;
}

Array::Array(int size )
{
  _size = size;
}

---------------------------------------------------------------------------=
-----
#include <iostream>
#include "Array.h"

int main() {
  const int array_size = 4;

  // elemType becomes int
  Array<int> ia(array_size);

  // elemType becomes double
  Array<double> da(array_size);

  // elemType becomes char
  Array<char> ca(array_size);

   int ix;

   for ( ix = 0; ix < array_size; ++ix ) {
         ia[ix] = ix;
         da[ix] = ix * 1.75;
         ca[ix] = ix + 'a';
    }

    for ( ix = 0; ix < array_size; ++ix )
          std::cout << "[ " << ix << " ] ia: " << ia[ix]
               << "\tca: " << ca[ix]
               << "\tda: " << da[ix] << std::endl;

 return 0;
}
------------------------------------------
but my compiler result is
------------
eric@eric-laptop:~/CppPrimer3$ g++ Array.cpp pg52.cpp
Array.cpp:13:1: error: invalid use of template-name =91Array' without an
argument list
Array.cpp:18:1: error: invalid use of template-name =91Array' without an
argument list
eric@eric-laptop:~/CppPrimer3$
--------------------
Is that Array is reserve word in C++ so we can not use it?
so idea what these errors talk about, plz help, thank a lot in
advance, Eric