The requirements of several friends proceeding to settle in the Colonies, and wishing to devote themselves to Cotton culture, Coffee planting, the raising of Tobacco, Indigo, and other agricultural staples, first called my attention to the consideration of this fertile and extensive field of investigation. Professor Solly, in one of the series of Lectures on the results of the Great Exhibition, delivered before the Society of Arts, early last year, made some practical remarks bearing on the subject:-- "If (he said) you were to place before any manufacturer specimens of all the substances which could be employed in his particular manufacture, and if you could tell him from whence each could be procured, its cost, the quantities in which he might obtain it, and its physical and chemical properties, he would soon be able to select for himself the one best suited for his purposes. This, however, has never happened in relation to any one art; in every case manufacturers have had to make the best of the materials which chance or accident has brought before them. It is strange and startling, but nevertheless perfectly true, that even at the present time there are many excellent and abundant productions of nature with which not only our manufacturers, but, in some instances, even our men of science, are wholly unacquainted. _There is not a single book published which gives even tolerably complete information on any one of the different classes of vegetable raw produce at present under our consideration_. The truth of these remarks will be felt strongly by any one who takes the trouble to examine any of these great divisions of raw materials. He will obtain tolerably complete information respecting most of those substances which are known in trade and commerce; but of the greater number of those not known to the broker, he will learn little or nothing. Men of science, for the most part, look down upon such knowledge. The practical uses of any substances, the wants and difficulties of the manufacturer, are regarded as mere trade questions, vulgar and low--simple questions of money. On the other hand, mere men of business do not feel the want of such knowledge, because, in the first place, they are ignorant of its existence, and secondly, because they do not see how it could aid them or their business; and if it should happen that an enterprising manufacturer desires to learn something of the cultivation and production of the raw material with which he works, he generally finds it quite impossible to obtain any really sound and useful information. In such cases, if he is a man of energy and of capital, he often is at the cost of sending out a perfectly qualified person to some distant part of the globe, to learn for him those practical details which he desires to know. This is no