Steamer Ontario. - This old favorite made her first appearance in our harbor this morning, from Charlotte where she has been laid up the past winter. Her exterior presents the appearance of a new boat, having been entirely repainted, and the interior is as usual elegant. We regret to learn that Capt. Throop is unable to take the command at present, owing to sickness, although it is hoped he will soon be enabled to do so. Capt. Estes, of the "Cararact" is in command this trip. The officers of the "Ontario" are all too well known to render commendation from us necessary. We are pleased to see that Mr. W. B. Phelps has resumed his position as Clerk, for we did not wish to lose him from our Lake. Mr. Timerson, as Steward, is again on hand to catch for 'the appetite of the traveling public,' and in conjunction with Mr. Oakley, in the kitchen, will maintain the good reputation of the Ontario's table. She left this port about 8 o'clock this morning with a fair compliment of passengers.