C 1038 ) 
be an acceptable fervice,'" for the Honour of the Nation^ 
and of that Colledge in particular, and of the Royal Society. 
But I muft beg your Pardon for jhis long Digreffion : 
And fubfcribe my felf, an HumWe Servant of the Royal 
Society 3 And 
Tours to fcYvz you^ 
. John Wallis, 
IV. Account 0/^ 5oo4 viz. 
Aloyfi Fcrdinandi Comit. Marfigli Danubialis 
operis Prodromus. 
Ad Regiam Societatcm Anglicanatn, Fol. 1700, 
THe Author of this VroAromus hath gireri feveral 
proofs of his great Abilities in this part of Learn- 
ing, as in his OJfervdzioni eniorno al BosfoYo Tracioy 
Printed at Rome in \to. 1681. In his Dijfertatione Epi* 
fiolare del fosforo minerale^ 0 Sia della Pietra illHmnahile 
Bolognefe^ at Leipjick in ^to cum fig. 1698. 
The Piece now before us is only a Plan or Model of 
a great Work, which Signor Marfigli is carrying on in fix 
large Volumes in Fol. Imperial Paper, which he defigns 
to dedicate to the prefent Emperor of Germany^ by whofe 
Favour he was employed many years in the Turkifli 
Wars, and continues to receive a noble Salary from the 
fame hand. 
The firft Tome is to contain the Geographical Part, 
illuftrated with many Charts and aftual Surveys of the 
Banks of the Danube^ from its rife to its exit into the 
. Euxine Sea, defcribing all along the Channels, Whirl- 
pools 
