varying hourly with the sun's altitude, should have told him that the deflection is a mere weather-deviating circumstance. On the other hand, who perceives the natural truths elicited by even his own experiments! That truly great philosopher, Priestly, remained ignorant that his own experiments on blood and air brought to light the principle on which the blood is arterialized, without coming in contact with the air in the lungs; of which experiments the faculty are reprehensibly ignorant at present; also the principle of congelation without cold. It is a general error that men must be philosophers because they are mathematicians and first-rate experimenters, yet do not know what keeps the blood in motion, nor how water becomes ice. What experiment was ever so absurdly illustrated as that of ice formed in the midst of fire; which is explained by, "evaporation generating cold in a red-hot crucible," and while maintaining that cold is only the absence of heat. The _rationale_ is: the oxygen of water is the hindrance to congelation, which the evaporation carries off, and the remaining elements of the water are compressed into ice. What are the elementary constituents of water, has yet to be learned. Misled by false-directing philosophy, the analysis of a rotten potato, in quest of the cause of the vegetable epidemic, is as wise as were the same scientific procedure taken on the contents of a pustule to discover the cause of the small pox: the result in both cases must be a complete new formation; and in the former, the result could be no preventive information whatever to the planter. To convince planters and remove all timidity, every garden owner should plant an experimental patch with potato _peelings_, each having an eye; the crop is certain and good, and supplies the cottager with the next year's seed at no expense. The _cutting_ for seed may be of exhausted vegetating power, while the peeling of even the same potato may be as sound as ever. The badly grown potatoes of the previous crop caused those of the following to be of imperfect growth and perishable: hence the general potato-rot. PHYSIOLOGY AND FUNCTION OF THE SENSES. By the popular expression, "Evidence of the Senses," is universally understood, the perception, or seeing external bodies by the organs of sense: yet externals are invisible and the senses insentient. This mistake, common among the fathers of every age, has corrupted the prevalent false philosophy tenfold.