We regret to have occasion this week to direct the attention of steamboat inspectors specially, and the public generally, to another explosion, which occurred on the steamboat Col. Crossman, from New Orleans to St. Louis, on the 4th inst. She had on board two hundred passengers, twenty-five of whom are reported to have lost their lives. This steamer, like the one noticed in our last number, also took fire, and burned to the water's edge. If the inspectors have become careless in the performance of their duties, they should not be allowed to keep their places. We -have received the reports of the committees of the Massachusetts Horticultural Society for 1857.