594 PHILOSOPHICAL TRANSACTIONS. [aNNO 177Q. 



* Daniells Bernouilli, Hydrodynamica, in quarto, Argentorati, 1738. 



* Domeniche Guglielmini, della Natura de Fiumi, Bononiae, 1697, in quarto. 

 Ejusdem de Mensura Aquarum fluentium, Bononiae, in quarto. 



* Joh. Polenus, de Castellis et de Motu Aquae mixto, Patavii, 1697, 171S, 

 1723. 



* Raccolta d'Autori che trattano del Moto dell' Acque, Fiorenza, 1723, 

 3 vols. 4to. 



Jac. Hermannus, in Phoronomia, cap. 10, page 226 et seq. 



Christ. Wolf, Curs. Mathem. Hydraulicae, cap. 6, edit. Genevae, in quarto, 

 1740. 



M. De BufFon, sur les Fleuves, dans son Histoire Naturelle, torn. 1, p. 38 

 to 100. 



Several Memoirs upon this subject in the collection of the Royal Academy of 

 Sciences of Paris, particularly those of M. Pitot, in the volumes for 1730 and 

 1732. 



S'Gravesande, in Elementis Physicae, torn. 1, lib. 2, cap. 10. 



* R. P. Lecchi S. J. Hydrostatica, Mediolani, 1765. In this excellent work 

 are several pieces by Father Boscovich on the same subject. 



* Stattleri Physica, vol. 3, p. 232 — 286. de cursu Fluminum, ejusque Men- 

 suratione et Directione. Aug. Vindel. 1772, 8 vols, in octavo. This author 

 gives many late observations and experiments on the motion and measure of 

 currents, as those of Zendrini, Himenii, &c. 



Two other authors have lately written on rivers and canals, but their works 

 are not yet come to my hands : viz. 



Father Frisi, an Italian Barnabite, Professor of Mathematics at Milan, and 

 M. De Lalande, of the Royal Academy of Sciences at Paris, who has just pub- 

 lished a history in folio, with plates, of all the navigable canals in the world that 

 have come to his knowledge. 



Among the above authors, those marked with an asterisk (*) have treated the 

 subject with the greatest exactness or most extent. After this, in several more 

 sections, the author mentions numerous properties of canals and rivers, in a 

 systematic manner. But these being all of the most common kind, unaccompa- 

 nied with any new discoveries or new principles ; the paper appearing to be out 

 of its place in these Transactions, and rather resembling a book or methodical 

 treatise, of more than 100 quarto pages, of common-place matter and maxims; 

 we shall therefore limit our abridgement of it to little more than a brief account 

 of the chief matters and titles of the sections. 



Section 2, is on the theory of rivers and canals, in definitions, and several 

 common maxims ; on the motions of bodies on inclined planes ; on the nature 

 of rivers and flowing waters ; then the application of the laws of the accelera- 



