///. GU AGING PROMOTED, Being an Appendix 
toScereomaticalPropofitions , formerly puiltjheal ij Rob. An- 
derfoD. Printed for Jofii. Coniers 1669. in Octavo. 
TN this fmall Trad the Author rcdaceth his former Doftrine of Gaf^i^ 
X w£ to farther Pradicc, and illuftrateth the fame by Examples. 
And firft he fuppofeth the j^xis of a Fjrdmid^ Cone^ Sphere, F^4^ 
iolical, and Hyperklical Conoid , and of a Figure of different Safes , which 
he calls a FmfirHm of a Prifme , which if round , may refemble a Drink- 
-ingCup like an Horn, having its top fqueezed into an £/7ip^*Vjt. form , and 
the bottom remaining either a Circle, or be likewife comprefs'd ; the faid 
Axis to be divided into equal Segments , and Plains parting through thofe 
Segments creft to the Axis •, to divide the above-mention'd Solids into di- 
vers Portions or Rings : and upon thefe Foundations, vIk.. That in the 
^Paralfoiical Conoid the fecond differences of the Solid Contents of the 
whole Figures fo divided arc equal ; but in the reft of thefc Solids their 
f^bird Differences are equal: he hathfuted his Examples to the j^xes cue 
Iby the faid Plains at 3 Inches diftance from each other , (hewing firft the 
nature of the differences in hand, and then fomc eafie wayes to attain a 
firft, fecond, and third difference ; and ho^v out of them to compute the 
rfeveral Capacities fought by Additions of Differences plac*d in fevcra! 
Columns. Laftly , He gives directions for the more cafie Calculation of 
the fecond Segments of the Sphere tini Spheroid, 
But we muft not omit to take notice, that this Author , fpeaking p4£, 
a3. of fuch Elliptick Solids, whofc Bafes are unlike, aflerts. That every 
4wQ]\ tElllptick^S6lid is equal to the Fruftrum or Tru^cns of an Hyperbotic\ 
"Conoid y the Circular ^^/fx whereof are equal to the EUiptick^ Bafes of 
the Solid propos'd • and the Height of the one Frnflrum equal to the Height 
of the other : the Invention and Demonftration whereof argues good 
^Knowledge in Geometry, 
L i. r. fm^um D i« By ib. 1. 2«. ^T. f^niJJime mniumageU 
Z 0 N D O N, 
-Printed by T. N. fov fohn Marty h Printer to the Royal Society , and 
re to be fold at th^ Bell a little without Tempk-Bar, 1669. 
