SCIENTIFIC AMERICAN SUPPLEMENT, No. 957. 15295 0'88); "Heures a la Cavalii'lre," Paris, T. de Hansy, two pages of stanzas in honor of the r.erson pictured. evident, in the molecule, the groupings of atoms that 1751, 223 pp., old green morocco binding in a case of We see in succession Frederick William, King of �r�s�rved them�elyes il ! tact in react. ions. The impos antique calf (1'32 X O'S inch); "La Sainte Bible mise Prussi � ) the Princess of Orleans, Sam uel Rogers, Ade-slblhty of explammg

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... ith such formulas the reaction� en vers," by J. P. J. du Bois. at La Haye, P. Servas laide Aemble, and Ludwig Dobler. Then come the of the polybasic acids studied by Graham, Wurtz and 1754, 192 pp. , several engravings (1'44 X 0'8 inch) , old calendar and some information as to the royal house. Liebig, and of the poly atomic acids by Wurtz and blue silk cover inclosed in an antique calf case entirely the ministers, etc., in all forty-seven pages. The Berthelot, made one think of doing better. covered with stamped ornaments; "Le Reveil deI'Ame," almanac of 1837 contains a dedication to the Queen, It certainly took a long time to discover the truth. Annecy, 1784, with 56 pp. (1'64 X 1'16 inch), in an old and seems to be the first of the series. Among its It required the splendid work and_£ersevering sagacitv silk cover ornamented with golden threads and span-,figures there is a charming portrait of Malibran, ac-of Cahours, Kolbe, Frankland, Wurtz, Kekule, and gles. . I companied with stanzas and four pages of a rondo in! Couper to reach the suspicion in the first place and Let us stop to admire, in their elegant covers of old microscopic music with words. In Fig. 3 we reproduce, then to render evident those mysterious attractive morocco, several Bibles published at London during of act,ual size, two of the engravings of the almanac of forces that manifest themselves in the atoms, and that the first half of the eighteenth century and measuring I ' 1842, representing the princess royal and Rachel, the are called valences.