Hummel has composed 24Etudes,Opus125 and 24Preludes,Opus67. 
Also,THE PIANO METHOD which Hummel published in 1828 has strong 
influence through the 18th century.
The content : the finger ways from a thing such as the trill style of 
rendering and the pedal style of rendering.
And, he widely refers to a thing such as a mental attitude from 
a method of instruction to a piano learning man.
In being surprised the books contain about 2,200 music examples.
Short pieces which I introduce here contain a musical piece of all 
types from a thing for a beginner's to a thing for the higher man.

Sixty Practice Pieces from the Piano Method (1828)
1) Method No.1 to 20
2) Method No.21 to 30
3) Method No.31 to 40
4) Method No.41 to 50
5) Method No.51 to 60
Sub.title:
Method No.5-Air Russe
Method No.40-Gigue
Method No.51-Rondo 
Method No.52-March 
Method No.53-Polacca 

Miscellaneous Pieces from the Piano Method(1828)
3 pieces are non stop.
(Mikio Tao)

Note:
The Piano method was a monumental project that occupied Hummel for some
 five years. 
Published simultaneously in England,France,and Austria,it apparentry 
sold out on the first day,at least in German speaking Europe, 
despite its high cost.
Most of its hundreds of pages contist of exercises, but Hummel also 
included works by other composers,including the great C-sharp minor fugue 
from the Well Tempered Clavier,Book1,the performance of which 
he comsidered the ultimate aim of any fine musician.
He also wrote Sixty "Exercise Pieces" of progressing difficulty.
Together with several larger exercises in grace notes,these pieces form 
the body of the true compositions in the Piano Method.
(Joel Sachs:Complete works for Piano, Vol.3)