(5*4) 
when thofe Fumes were pals d, and the Receiver grew 
clear, they were after a while fucceeded by another 
fort that (eem'd in the Receiver to give a faint blewifh 
Light, almoft like that of little burning Matches dipt 
in Sulphur. And laft of all, the Fire being very ve- 
hement, there pafsd over another Subftance, that was 
judg'd more ponderous than the former, becaufe it 
fell through the Water to the bottom of the Receiver ; 
whence being taken out, ( and partly even vvhilft it 
ftay'd there, it) appeared by feveral Effects, and other 
Vh&nernena, to be fuch a kind [of Subftance as we de- 
fired and expected. 
IL Problema Florentinnm, de mira Templi Te- 
ftudine QnadrabiVu A DoSliJpmo Dn°. J<h 
banne Wallis^ S. T. D. SolntHm. 
LIbet hie fubjungere, Problema quoddam (interven- 
tu ClarifTimi Viri D. Guilielmi Bridgman) ad me 
tranfmiflum,de mira cujufdam Templi Teftudine Qua- 
drabili, meamque ejufdem Solutionem, cum fubj undo 
Scholio earn explicante. 
D. Guilielmi Bridgman ad me Epiftola, erat (Latins 
reddita) ad hunc fenfum ; 
Reverendo Viro, D. Wallis S. T. D. Geome* 
tride Profejfori, Oxonii. 
Augufli 30. 1691. 
fnclufam churtulam (Reverende Vir) Florentia mihi 
wiiffam, utad te defer at ur (de qua fententiam tuam expe- 
tunt 
