DICK & FITZGERALD, No. 18 Ann Street, New York. * * * * * THE FOUNTAIN OF ALL KNOWLEDGE. THE REASON WHY: A CAREFUL COLLECTION OF Some Thousands of Reasons for Things which, though Generally Known, are Imperfectly Understood. A BOOK OF CONDENSED SCIENTIFIC KNOWLEDGE FOR THE MILLION. BY THE AUTHOR OF "INQUIRE WITHIN." This is a goodly sized volume of 356 pages, comprising a sort of Encyclopedia of Scientific Information of all kinds. It is arranged with an Alphabetical Index, in referring to which you can solve almost any problem in Natural Philosophy or Learned Science that may come up. It is a book that will give you the cream of the information that a long course of practical experiments and profound study has imparted to the _savants_ and philosophers of this progressive age. It contains a collection and solution of Thirteen Hundred & Thirty-Two Facts in Science & Philosophy, some of which, on their first discovery, puzzled the most learned and apt scholars. It is useless to go into details of this excellent work. Suffice it to say, that it treats on every imaginable subject pertaining to Causes and Effects, and must necessarily be invaluable to all persons who desire KNOWLEDGE, and whose means and position in life have prevented them from acquiring it by a regular and tedious course of Study. We hesitate not to say, that any one who closely reads this volume will obtain as much real learning in a few days as years of study and patient research would afford them in a regular course. In a word it makes you a learned and refined person with spending but very little money, time or trouble. No pains have been spared by the Author to make this a popular book, in fact a book for the million, and some idea may be formed of its vast usefulness when we inform the reader that THE REASON WHY has an Index of Contents requiring Forty Columns of Fine Type. No person who desires to figure in refined and intelligent circles should delay purchasing a copy of this capital work, for it will furnish thousands of ideas and important topics of conversation, so that the most ignorant person by reading it will be posted up on all scientific subjects. What Haydn's Dictionary of Dates is in regard to historical events, this wonderful book is in respect to scientific facts. The plan of the book and its execution, leave nothing to be desired. We can cordially recommend this work to all those inquirers, young and old, of both sexes, who are never satisfied until they know the "reason why." The man who goes out into the world, or attempts to attend properly to his domestic duties, will find himself, however abundantly supplied with books or bullion, perpetually embarrassed for the want of small facts and small change. This volume supplies the Ready Coin of Conversation.