This essay is a study of Vvedenskij's works starting from his 1888 dis
sertation up to the turn of the century. I attempt to show that althou
gh his explicit aim was to update Kant's philosophy of science in ligh
t of developments in physics in the 19th century, Vvedenskij departed
considerably from Kant's position with respect to both first philosoph
y and reflection on the achievements of the natural sciences. Vvedensk
ij's increasing concern with practical philosophy in the 1890s led him
to correct a perceived anomaly in Kant's position by postulating a ti
me in itself, an unrecognized consequence of which would be to undermi
ne the apodicticity of mathematics.