On the 13th of April, 1849, Colonel Mason at his own request, was relieved from the post of Governor of California, and Brigadier General Riley took his place. The despatch of that officer, dated 30th of June, following his assuming the duties of his post, is important, as containing an account of the state of feeling in California, upon the subject of the laws at that time in force, and the difficulties with various assemblies elected in the northern part of the territories. EXECUTIVE DEPARTMENT OF CALIFORNIA, _Monterey, June 30, 1849_. GENERAL: I have the honor to transmit herewith copies of all civil correspondence and papers since the 13th of April last, at which time I relieved Colonel Mason from his duties as Governor of California. It was (with the advice of Colonel Mason) my intention, on assuming the direction of civil affairs in this country, to complete the organization of the existing government; at the same time to call a convention for forming a State Constitution, or plan of territorial government, to be submitted to Congress for its approval. But on further consultation it was deemed best to postpone all action on this subject, until I could ascertain what had been done in Congress. On the first instant I received reliable information by the steamer "Edith" that that body had adjourned without organizing any territorial government for this country; and accordingly, on the 3d instant I issued my proclamation to the people of California, defining what was understood to be the legal position of affairs here, and pointing out the course it was deemed advisable to pursue in order to procure a new political organization better adapted to the character and present condition of the country. The course indicated in my proclamation will be adopted by the people, almost unanimously, and there is now little or no doubt that the convention will meet on the first of September next and form a State Constitution, to be submitted to Congress in the early part of the coming session. A few prefer a territorial organization, but I think a majority will be in favor of a State government, so as to avoid all further difficulties respecting the question of slavery. This question will probably be submitted, together with the Constitution, to a direct vote of the people, in order that the wishes of the people of California may be clearly and fully expressed. Of course, the Constitution or plan of territorial government formed by this convention can have no legal force till approved by Congress.