( 579 ) Numb. iq6'» 
PHILOSOPHICAL 
TRANSACTIONS. 
For the Month of January, 169*3 
The CONTENTS. 
1. H E Preface. 2. A Paper of the Honour ah le 
J. Robert Boyle, late Fellow of the Royal Society^ 
depofited with the Secretaries of the R. S. A*. 1680. con- 
taining a Method of preparing the Phofphorus of Humane 
Vrine. 3. A Solution of the Florentine Problem 
touching the Figure of a Cupola, whofe Windows leing 
cut out, the Remainder u Quadrahle. By the Reverend 
John Wallis, S. T.D. 4. The Extratl of two Letters 
from Mr. Anth. Leeuwenfooek of Delft ahout the Tef ti- 
des of a Rat, and the Ammalculcs therein contained 
with fome Ohfervations of Small Animals found in Oy- 
fters, <W i» the Sap of Vines, 5. £0*»* Ohfervations in 
the dijfettion of a Rat, with a Figure of the Genital 
parrs thereof By Mr. Ric Waller, S. R. Seer. 5. An 
EHimate of the* Degrees of the Mortality of Mankind 
drawn from curious Tahles of the Births and funerals at 
the City of Breflaw, with an Attempt to af certain the 
A Price 
