6 Advertising Sheet, §c. 
| WORKS ON NATURAL HISTORY, 
| BY 
Pror. LOUIS AGASSIZ, 
OF NEUCHATEL, IN SWITZERLAND. 
To be had of Jent & Gassmann, Soleure. 
I. Recherches sur les Poissons Fossiles—1st to 13th Livraison. 
Text in 4to., Plates in fol. Price of each Livraison, 36 frs. 
14th Livraison is in the press ; the 15th will appear at the end of 
the year, (1840. 
Il. Histoire Naturelle des Poissons d’Eau Douce de l’ Europe 
| Centrale—Ist Livraison, 27 Plates in fol. with text in French, Ger- 
man, and English. Price of the vellum copy, 75 fr.; of the su- 
perfine a ae with great care, 100 fr. ; of the edition in 
carton vélin, 
This work wil — in 5 or 6 Livraisons, with 90 Plates in all 
in folio, and two stout volumes of text in 8vo. The price of the 
Livraisons will depend on the number of Plates. The first Liv. con- 
tains the genera Salmo and Thymallus; the second division will 
contain the Embryology of the Salmones. 
Ti. Monographies D’ Echinodermes Vivans et Fossiles—1st Liv- 
raison containing the Salénies, 4 sheets of text, and 5 Plates, in 
large 4to. price “10 fr. This work will be composed of 10 to 12 
Livraisons, embracing about 150 Plates ; the price of each division 
to be regulated by the number of Plates. 
IV. Description des Echinodermes Fossiles de la Suisse—first 
part, Spatangoides and lag esc poe 14 sheets of text, and 14 
Plates in 4to. price 15 fr. Second part, Cidarides, 14 sheets and 
11 Plates, price 12 fr. The third, pace the Crinoidea, will 
be published next year. 
V. Etudes Critiques sur les Mollusques Fossiles—1st Livraison, 
containing the Trigonie of the Jura and the Chalk, with 11 Plates, 
price 12 fr. 
VI. Memoire sur les Moules de Mollusques Vivans et Fossiles 
—lIst part, containing the casts of living Acéphales, 6 sheets, 12 
Plates, price 12 fr 
VII. Etudes sur = Glaciers—32 Plates in folio, with text in 
large @vo. price 40 
Mr. Augustus Seni of New York, is the friend and agent of 
M. Agassiz in America, and will procure any of the foregoing. 
