and uniformly intent upon this object, except that sometimes, as already stated, he appears unhinged and irritable by the unsuccessful issue of his calculations, and is then more liable to take offence, especially at any disrespectful deportment towards him, for it must be observed that he is still very fond of his title and of that deference due to a man of rank. Occasionally, like some alchemist of old, he fancies that some äerial being, which he calls the clown of the air, plagues him in various strange ways and interrupts his operations, for which mischievous interference he, in his way, severely scolds him. The politeness which may be traced in his manners, is evidently the result or remains of his old habits, as he is so absorbed in abstract speculations that all attention to himself or external objects is utterly excluded; he is always solitary, but it is like the solitariness of one whose intense studies allow him no time for fellowship or the exercise of social feelings, so much so, that notwithstanding a consciousness of kind and respectful treatment towards him, he scarcely yet seems to know the name of his attendant. Although his system is delicately susceptible of changes of temperature, he scarcely ever notices it himself; and when roused to pay attention to his feelings, he says that it is the clown in the air that has teased him with the iron ague. He has been subject to occasional attacks of asthma, brought on, apparently, by exposure to cold in the night time, during these operations, (for he frequently jumps out of his bed to carry on this great patriotic duty.) Though he can, if properly roused and managed, still answer questions much more correctly than all these appearances would indicate, yet it is evident that his mind is gradually declining, from age, exertion, and the nature of his case; he is an object of interest and sympathy, and nothing can exceed the way in which it is shewn towards him by his attendant. OBSERVATION XII. The correspondence between the insane state and the previous character and habits are in most cases, and certainly in this, very striking. On this subject I refer to the Essay on the Changes and Correspondence between the previous Natural Character, and that which they exhibit in their Insane State. There is another fact in this last case, which may conveniently serve the purpose of introducing some observations ON THE EFFECTS OF HEAT AND COLD AND THE STATE AND CHANGES OF TEMPERATURE IN INSANE PERSONS, which may be considered as an Appendage to the remarks made in Observation V. and IX. The fact to which I allude in this case is this, viz. that his system “is delicately susceptible of changes of temperature, but that he himself scarcely ever notices it.”