THE DIVISIBILITY OF VITALITY. 21 



graphs. Such of my readers as indulge in the kixury of a hunt over the 

 old book-stalls may be so fortunate as to meet with a copy of this work. 

 But those who feel particularly interested in the subject, should endeavour 

 to procure M.Trembley's 4to, intitled ^* Memoires pour servir a VHistoire 

 d^un Genre de Polypes d'Eau douce. Par A. Trembler/, de la Societe 

 Roy ale. A Leide^ 1744." This volume is one of the most delightful 

 contributions to natural knowledge ever published : its narrative is en- 

 livened by so refreshing an enthusiasm, its descriptions are so graphic, 

 and the illustrations so faithful, and in the highest excellence of art, (being 

 engraved by the celebrated Lyonet), that it is worthy of a place in the 

 best libraries. I obtained a copy some years since through M. Bailliere, 

 the foreign bookseller. Regent Street, London. 



