INTRODUCTION. 



A CONVINCED follower of Darwin and Spencer, 

 I purpose demonstrating that Marxian 

 socialism the only kind that has a positive 

 method and scientific worth, and that has 

 power henceforward to inspire and group the 

 social democrats of the whole civilised world 

 is only the practical and fruitful comple- 

 ment in social life of that modern scientific 

 revolution, which, inaugurated several centur- 

 ies back by the revival of the experimental 

 method in all the branches of human know- 

 ledge, has triumphed in our days, thanks to 

 the labours of Charles Darwin and Herbert 

 Spencer. 



It is true that Darwin, and especially 

 Spencer, stopped short half -way from the final 

 conclusions of religious, political and social 

 order, which necessarily follow from ; their 

 indisputable premises. But that is only an 

 individual episode which cannot stop the 

 inevitable march of science or delay the 

 fulfilment of its practical consequences which 

 accord admirably with the saddest necessities 

 of contemporary life. This is but one more 

 obligation to us to render justice to the 

 scientific and political life of Karl Marx, who 

 completes the renovation of modern scientific 

 thought. 



Feeling and thought are the two inseparable 

 motive forces in the individual and the 

 collective life. 



Socialism, w.hich was only a few years ago 

 at the mercy of the deep-rooted but undiscip- 

 lined fluctuations of humanitarian sentiment- 



