The _Journal Officiel_ of the Commune of to-day accuses the agents of Versailles of having caused the explosion of the cartridge manufactory, and says that a hundred persons have fallen victims to it. Four arrests have been made in connexion with this affair. The _Verite_ demonstrates that the explosion could not have been the result of intention, but was solely attributable to accident. The same paper states that no shell fell in the Champ de Mars at the time of the explosion. The Versailles troops are constructing trenches within 200 yards of the Auteuil Gate, but the breach is not yet assailable. Fort Montrouge still holds out, but offers only a feeble resistance. The Communists claim to-day to have repulsed all attacks. The bombardment is incessant. The German troops are taking up imposing positions. The tribunals of the Commune have decided to-day as to who among the prisoners in the hands of the Commune are to be regarded as hostages. It is asserted that three hostages will be executed to-morrow. MAY 19th. The firing was heavier last night than it has ever been. There were both a cannonade and a fusillade. Everybody thought that the Versaillais had at last made their assault. It appears that the Communists attempted a sortie, and were repulsed with great loss. Numerous waggons filled with wounded were taken to Versailles. Various battalions returned to Paris, apparently much dispirited. Numerous reinforcements, however, were brought up. The bullets are falling so thickly about the ramparts that the Communists with difficulty maintain their position there. The Versailles shell-practice has improved. The shells burst about the bastions instead of in the town. The conscription is carried on with increased rigour, death being threatened to those who refuse to serve. A Lieutenant-Colonel and a Commandant have been sentenced, the one to 15 years' and the other to 10 years' imprisonment for cowardice, and their battalion has been dissolved. The Chief and Staff of the 6th Legion have been dismissed for not disarming the refractory battalions. It is said the prisoners accused of firing the cartridge manufactory are to be shot in 24 hours. Much fear is entertained for the fate of the hostages, whose execution has been so strongly advocated in the Commune, in reprisal for the alleged violation and murder of an _infirmiere_ by the Versaillais. Some iron cupola-shaped cases, capable of holding each 1,000lb. of powder, were to-day taken to the barricades near the ramparts for the purpose of blowing them up if necessary. It has been proposed in the Commune to abolish all titles of rank, with the emoluments and advantages appertaining to them; also that all children now illegitimate shall be for the future legitimate; and that, instead of the present form of marriage, any man over 18 and woman over 16 may be allowed to go before a municipal magistrate and declare their wish to marry.