Men profound in their scientific skill and learning, have long and in vain sought for the discovery or invention of some means of securing to the future, the colors of the present. All Europe has been alive to this great desideratum, and many have presumed it an impossibility, while some few persisted, flattered by hope and encouraged by the almost daily announcement of some new discovery or invention, that heretofore had been deemed only as having existence in the dreamy imagination or a perspective future. We hail the discovery of the Hillotype as an epoch bright in the history of science, as well as impregnated with interest to aid in unfolding a volume of investigation which has so long commanded the attention of learned and philosophical minds, as the "colored rays of light."

The subject of reflected light and its colors has long agitated the scientific mind. Much has been said and written; elaborate and laborious "Essays," "Researches" and "Treatises" have penetrated our libraries and proved valuable auxiliaries in pushing the interest of those engaged in furthering agricultural and chemical pursuits. This branch of natural science is regarded as one of the most important, and, at the present moment, it is rendered doubly interesting from the fact of Mr. Hill's discovery. We may look forward for new developments, which will prove no less surprising than that of rendering permanent, on a metallic plate, the variegated beauties of the solar spectrum.

We are, as it were, standing upon an eminence from which we can survey the present, retrospect the past, and almost sketch the bright outline of a coming future. Here lies a field for animated speculation, in which nature's student can satiate his appetite in the study of nature, in a province hitherto unknown and unexplored; he may here realize truths purely sublime, painted in the glowing "colors of nature," and rendered prominent upon the tablet of his memory.

We present the following communication from Mr. Hill, which our readers will peruse with pleasure:

For the Daguerreian Journal.

S. D. Humphrey, Esq.;—Being detained here a day on my way from your city, I relieve myself a little from the tedium of delay, by a few scribblings to your valuable Journal. I will give a few particulars respecting my pictures, &c.

I have now fifty-five specimens. They are all equally perfect. It is quite remarkable that I have never yet made a partial failure. Those impressions which have had too much light, are nearly as strong, sound, brilliant and beautiful as those correctly timed in the camera, being inferior only in having the colors less deep. Even the whites retain their strength. The folds of the linen are always well defined. Blue or solarized linen is unknown in my process, and there is always a strength and clearness in the whites, unattainable by mercury. During the past winter I have several times taken a view in which there is a deep red house, while the ground was covered with snow. For experiment I exposed the plate so long as to reduce the bright red of the house to a very light red, while at the same time, the white snow was developed with a beautiful whiteness.

I have copied several very highly colored French prints. The copies are far superior to the originals, in that, while they have every tint of color, they are exceedingly brilliant. This is a characteristic in which I never fail, even with the plates merely cleaned with rotten stone—the brilliancy depending on other causes. Well polished plates, however, are preferable for other reasons. It is essential that the plates should be very pure, free from scum? dampness, and organic matter of every kind, and I am experimenting with different substances, in hopes of finding something that will more perfectly cleanse, while it thoroughly polishes. I would be very thankful to any person who might furnish me with valuable hints on this point, as I am convinced that here lies one great cause of uncertainty.

My trouble with the yellow, which you mentioned in the last number of the "Daguerreian Journal," relates only to the homogeneous rays, orange, buff, and all the various shades of yellow come out true except the chrome yellow which appears less brilliant. This, however, is thought by distinguished artists, no serious objection.

My late visit to your city was much shorter than I could have wished. I called on a number of Artists, and the cordial manner in which they congratulated me has added much to my kindly feelings towards the fraternity, and strengthened my resolution to give all worthy Daguerreotypists and Artists, my process on terms which I believe will be satisfactory. As far as this is concerned, please say to such their interests are safe in my hands. I met with but one person anyway sceptical, and he is willing to be more fully satisfied when he "sees the pictures," which is very fair I am sure. While it is very cheering to me, in my truly arduous duties, to review the kind congratulations of my brother Artists, the most I am entitled to claim in an age when almost every announcement is regarded as humbug, is that the Daguerreian world will give me a fair chance to perfect my discovery. A few have seen my pictures, and their expressed opinions agree with mine, viz., that these pictures will astonish the world. I saw in your city, in the hands of Mr. Hite, Artist, some exquisite ivory miniatures. It astonished me that the human hand could paint "the form of the human face divine," in such a mode; but I pleasantly said to the Artist, what I now repeat in all seriousness, that the pictures by my process necessarily exceed in beauty the finest productions of the painter, they being drawn by light and painted by sun-beams.