This is a distinctly original departure in the writing of text books. It is presented to the proletariat as an additional weapon of knowledge in the fight against the bourgeoisie and is written from that point of view. We need hardly say that this innovation of writing text books on scientific subjects from particular political points of view is one which no scientific worker can welcome, constituting, as it does, a retrogression to the days when they had to be written from particular religious points of view. As the very essence of science is impartiality, it could not long survive if treated in this way. A text book on Chemistry from the tariff reformer's point of view, or one on Biology in support of the vegetarian cause would be books that would soon cease to have any serious value.