Our intelligence from CALIFORNIA is to the 1st of May. Trade was dull but was receiving an impulse from the reopening of the season for mining. The Legislature had adjourned after passing a large number of bills. One of its most important acts was one imposing a tax of $25 per month upon every foreigner who should dig for gold in the mines. The measure was vindicated on grounds of justice as well as from the necessities of the state treasury: difficulty was apprehended in some quarters in attempting to carry it out.--Public meetings had been held in regard to the unjust delay to which the application of the state for admission into the Union, is subjected by Congress. Intimations were thrown out that the state would withdraw her application and maintain her independence, unless action should be had: but they do not express any thing like the general sentiment of the people.--New veins of gold had been discovered--new towns commenced, and emigrants continued to arrive. Several heavy failures had occurred, but business generally was good. From the Isthmus of Panama we have news to the 1st of June. A serious riot had occurred there between the emigrants and the natives in which two or three were killed on each side. It grew out of the arrest of a negro boy on charge of theft, and a supposition on the part of the natives that the Americans intended to hang him. Such an incident, however, indicates an unpleasant state of feeling between the parties. Quiet, however, had been restored. * * * * * Of LITERARY and SCIENTIFIC Intelligence there is not much. Notices of the most important books published during the month will be found in another department of this Magazine. The question of the _Unity of the Human Race_ has been recently revived by some incidental remarks made at Charleston, S. C., by Prof. Agassiz of Harvard, which were opposed to that theory. Dr. Smyth, a learned divine of that city, wrote a book in refutation of the Professor; and we observe that the latter has pursued the matter still farther in a lecture subsequently delivered at Boston. He does not enter, however, into any full discussion of the subject, but takes occasion to disavow the intention imputed to him, of designing to question the authenticity or authority of the Mosaic Record.