A fortnightly and a bi-weekly newspaper, La Solidaridad serves as the principal organ of the Reform Movement in Spain.

[3] It pursued desires for:[4] On December 15, 1889, Marcelo H. del Pilar replaced Graciano López Jaena as the editor of La Solidaridad.

Penniless in Spain, del Pilar stopped the publication of La Solidaridad on November 15, 1895, with 7 volumes and 160 issues.

In del Pilar's farewell editorial, he said : Facing the obstacles that the reactionary persecutions bring in opposition to the circulation of this newspaper in the Philippines, we have to suspend our publication for some time.

[5]Several writers contributed to La Solidaridad over its six years of existence, like Antonio Luna, Anastacio Carpio, Mariano Ponce, Antonio María Regidor, José María Panganiban, Isabelo de los Reyes, Eduardo de Lete, José Alejandrino, and Pedro Paterno.

One of the most prolific contributors though was Rizal's confidant Ferdinand Blumentritt, whose impassioned defense of the Filipino interests was said to have been inspirational to the other writers and the readers of the newspaper alike.