Interesting proceedings have taken place in the United States Senate, in regard to the Tehuantepec route to California. The Mexican government has shown a disposition to prevent the construction of a road across Tehuantepec, which some senators think should be promptly rebuked. In a recent speech upon the subject, Mr. Mason, of Virginia, said that the acquisition of California and the intervening territory, placed this Government in the position of having some of its dependencies almost inaccessible. The discovery of the gold in California, made the subject of a communication with that region, of the deepest importance, and has naturally drawn the eyes of the world to the necessity of securing some safe, reliable, and speedy right of way to the Pacific Ocean. Panama has been sought, and it has been used as a place of transit, without any serious objection on the part of any government there. Mexico alone has interposed an obstacle to this desired communication with the Pacific. Mexico, from whom our territory was derived, and who is our neighbor and sister Republic, has alone refused the right of way to the world, and has not only refused the right of transit to other nations, but has also set aside an existing grant of that right. For years, enterprises have been projected to connect the two Oceans at Tehuantepec. In view of the vast importance of this connection, the minds of the people of the United States have been concentrated upon the discovery of that plan which shall be the least expensive, and at the same time the most certain and efficient, to unite the two Oceans by means of travel or transportation. Mr. Mason read a table showing the distance between New York and San Francisco by the Chagres route, to be 6650 miles; between New Orleans and San Francisco, by way of Chagres, 5675 miles; between New York and San Francisco, by the Tehuantepec route, 4970; between New Orleans and San Francisco, by the Tehuantepec, 3740 miles. The average time from New York to San Francisco, by the Chagres route, was 28 days, and the shortest 24 days. The average time by the Tehuantepec route was 19 days, and the shortest 15. From New Orleans, by way of Tehuantepec, the average time would be 14 days and the shortest 12 days. It is believed that spirited action on the part of our government will secure from Mexico the recognition of a right of way across Tehuantepec, which, according to Senator Mason's able representation, is but a matter of justice. Mexico is at present almost ready to fall to pieces, most of its states, or provinces, being in successful rebellion. She is not, therefore, in a condition to resist a formidable foreign power. It is lamentable when a government is weak, and yet dares to be unjust. The people of California have a considerable stake in the decision of the Tehuantepec question.