P. [490]. 'it' changed to 'it's'.
P. [542]. 'main ained' changed to 'maintained'.
P. [550]. 'of' added in 'of the Alps'.
P. [610]. 'de-defeated' changed to 'defeated'.
P, [611]. 'instal' changed to 'install'.
P. [611]. Added missing page number '174'.
Fixed various punctuation.