As to the singular phenomena to which our author intends to apply his argument, we can only say that they cannot be disproved in the mode attempted. We have no such knowledge of the facts as would enable us to form any opinion on the subject. But if many good men have not been egregiously deceived, the phenomena in question indicate the speedy discovery of relations not hitherto suspected to exist between matter and spirit. We do not anticipate the development of any other than natural laws. We are not credulous as to the interference of supernatural agencies; but we are fully prepared for almost any discoveries in the department of psychology, unveiling the mysterious but unquestionable relations of harmony--of action and reaction--existing between the soul of man and the universe of GOD. ON HORSEBACK. Those who have scanned with critical eye the cavalry regiments that have lately trooped through our cities from various States of the Union, on their way to the banks of the Potomac, must in candor, if with reluctance, acknowledge that we are not just yet a nation of horsemen. That our troopers have got a knack of 'sticking on' we will admit; but there are ways of fulfilling that necessary condition with more ease to the horse, more grace in the action, and more certainty of being able to use the weapons with precision, than the present very unartistic method common to horsemen generally in most parts of the country. Within a quarter of a century much improvement has taken place in the system of equestrianism under which the cavalry riders of Europe are instructed. Years ago, the long stirrups, such as our dragoons for the most part ride with, were taken up some inches by the riding masters of the British and other foreign services. It was the superior horsemanship of riders brought up in that best of all riding schools, the fox-hunting field, that first drew the attention of cavalry teachers to the necessity of affording a firmer _appui_ to the horseman than he can obtain from stirrups, to keep his feet in contact with which he is obliged to point his toes downward with painful perseverance. All the good 'hunting horsemen,' as they are termed, of England and Ireland, ride with short stirrups. So do the Cossack cavalry, the best troop horsemen, perhaps, in the world. The Arab rides with very short stirrups, which makes him look, when mounted, as if he were sitting on a low chair. But the seat thus obtained by the Arab is not one for men who have to gallop across a country intersected with fences and other obstacles. In stirrups, as in most other things, there is a _juste milieu_; and if the American dragoon is on one side of that, so is the Arab of the Desert on the other. The late Capt. Nolan, who fell in the famous charge of the Six Hundred at Balaklava, did much to introduce a perfect system of horsemanship into cavalry regiments. He published a work upon the subject, in which he advocates the short stirrup, and