The Government of BOLIVIA has issued the plan of a new Constitution, proposing among other measures, the preservation of the Roman Catholic religion as the religion of the state, the maintenance of amicable relations with American and European states, the liberty of the press, the independence of the judicial authority, the freedom of opinion on political subjects, and the protection of foreigners in the exercise of commercial pursuits. A National Convention has been convoked for the 16th of July. The number of deputies was to be 53. An insurrection has taken place in New-Grenada--the two southern provinces, Pasto and Tuquerres, having united in an attempt to overthrow the government, with the aid and encouragement of Ecuador. The President at once dispatched a military force to the scene of the revolt, but at the last advices it had not succeeded in its object, though two or three engagements had taken place. The government has issued proposals for a loan of $400,000 in specie, and unless this is effected soon, recourse must be had to forced contributions to defray the expenses of the war. Congress has abolished slavery, requiring only certain payments to the masters. No disturbance had arisen from the measure. GREAT BRITAIN. In the British Parliament important reforms in the Chancery system are still under discussion, and Lord Brougham is as ardent a reformer as he was thirty years ago. The census of Great Britain, taken on the 31st of March last, is a remarkable document. It shows that the small cluster of the British isles contains a larger population than the whole of this republic, exclusive of its slaves. The metropolis numbers upwards of two millions and a quarter, and added to its denizens during the last ten years about as many souls as New-York now reckons within its limits. But a more extraordinary and altogether different result appears in Ireland. It seems that the population of Ireland is at this moment very little more than six millions and a half. It is absolutely less than it was in 1821, and more than two millions short of the number that would have been reached in the natural order of things, but for the extraordinary occurrences of the last ten years. So startling a fact will of course become the subject of the closest inquiries.