Thus far the number of lives ascertained to be lost are six. Three of No. 3's Engine Company's men, who fell with the roof of Reynolds & Co.'s building, were swallowed up alive; the confusion of the morning, and the scattering of people, prevented a roll call to ascertain the names of the gallant but unfortunate firemen. A lady, next door to the place where the fire originated, is also reported burnt. The number scorched is enormous, all of whom, however, are carefully attended to by surgeons on board the Camanche. Every assistance possible was proffered by the captains and agents of the steamers, whose vessels were soon crowded with females. The levee was strewn with merchandise of every description, and the wind blowing from the northwest threw the sparks from the goods and saved them all. At 5 A.M., the fire had nearly ceased, the smouldering embers throwing huge clouds of smoke and lurid flashes, bringing desolation to the hearts of all who witnessed the sickening sight. The losses cannot be less than $5,000,000. On the evening of the 9th of November, another great fire occurred at San Francisco. Of this the California Whig of Nov. 10, gives the following account:-- Last evening, at half past eight o'clock, our citizens were alarmed by the dreadful cry of fire, which proved to be too well founded, for in less than five minutes the whole city was illumed by the lurid glare of the flames. There is much contradiction as to where the fire originated, but it is pretty generally conceded that it was in the upper story of the frame building on the corner of Merchant and Kearny streets, occupied by some lodgers. In a very short time all the buildings on the corner of the street were in a blaze, and wholly beyond the power of human aid to save. The close proximity of the building to the Union, on the opposite corner, rendered the probability of its destruction almost certain. In a very few minutes the latter building caught. In the meantime the frame buildings on Merchant, and between that and Clay streets caught, and were in a blaze. The whole force of the fire department were promptly on the spot, with their apparatus, and put into the most effective service. Never since they have been in organization have they displayed their unequalled energy and training as they did on this occasion. Fortunately for the safety of the lower part of the city, there was but little air stirring, and a slight misty rain had fallen during the day and evening, which checked the tendency of the fire to spread towards the bay. Had it not been for this, the mass of sparks falling upon the roofs of the frame buildings on the east side of Montgomery street, must have extended it to the whole lower side of the city. These buildings were covered with men provided with wet blankets, buckets of water, and every thing necessary to extinguish the flames, should they communicate to their roofs.