DR. WARWICK'S LECTURES - This gentleman gave the two first lectures of his course to a highly respectable audience at our Town Hall, on Monday and Wednesday last, and though, from the encomiums of our correspondents, we were led to anticipate a rich treat, our anticipations were far more realised by the clearness and ability with which he treated his subjects. The first lecture upon the natural history of aquatic insects and the infusoria, was illustrated by the oxy-hydrogen microscope, which admirably displayed the singularly strange and varied forms of those minute races. The powers of Dr. WARWICK's instrument are not only great (magnifying from 80,000 times to one million and a half), but there is a distinctness and lustre in the images projected upon the disc which makes the organization of the objects beautifully apparent, and their colour also when the opacity does not prohibit it. The second lecture was on the Gases, oxygen, nitrogen and hydrogen, and on carbonic acid; and a variety of experiments was made to elucidate their nature and effects. The experiments were very successful and infinite satisfaction to the audience. It will be seen by an advertisement in the preceding column, that Dr WARWICK (in addition to his regular course), intends to exhibit his splendid oxy-hydrogen microscope again on Wednesday and Friday next, when we strongly recommend those of our townsmen who love to contemplate the works of nature, to avail themselves of the present most favourable opportunity of profiting by this interesting exhibition. Lyn Nunn Brisbane Australia