Besides the manufactures produced at the Penitentiary on state account, the city has its due proportion of the various mechanic trades, and private manufactories. Of printing establishments there are as many as 11, (perhaps an undue proportion) from two of which there are issued daily, political and commercial papers,--from one, a semi-weekly political--from four, weekly Religious,--and from one, a monthly journal devoted to literature, &c. The others are either Book or Job Offices. The number of professional men is also considerable, and it is the more remarkable that so many members of the medical faculty should find employment in a city proverbial for the salubrity of its climate. Situated at the point of demarcation between the upper and lower districts, it is fortunately exempt from many of the maladies which are peculiar to both regions. It is neither visited by the enervating autumnal diseases of eastern Virginia, nor by the more violent and inflammatory attacks which belong to the upper country. The yellow fever, that scourge of cities more populous and commercial, has never prevailed. The population of Richmond has nearly trebled in 30 years. By the census of 1800, the free whites numbered, 2,837 Slaves, 2,293 Free colored persons, 607 ----- 5,737 By the census of 1830, the free whites amounted to 7,755 Slaves, 6,349 Free colored, 1,956 ------ 16,060 The several classes have increased in nearly corresponding ratios. Richmond has been frequently reproached for a want of hospitality, and if this virtue consists in unreserved and indiscriminate attention to strangers and visiters,--the reproach is probably not altogether unfounded. It must be acknowledged too, that the manners and customs of what are called the leading classes, are not characteristic of the old Virginia character,--which was frank, simple and unostentatious. In almost all considerable towns, even in republican America, artificial _castes_ or classes exist, which are founded principally upon the possession of wealth, or the mysterious refinements of fashion, and have but little reference either to moral or intellectual distinction. It is probable that this vice of cities is one of the chief sources of that prejudice which is felt towards them by the people of the country. These remarks, however, are not to be construed into a sweeping censure upon towns--for although in all dense populations, there is always a greater or less degree of human infirmity,--there is also an equal concentration of the more virtuous and noble qualities of our nature. For the Southern Literary Messenger.