(p6i) Numk 4f, 
PHILOSOPHIGA L 
TRANSACTIONS, 
^UM 21. 
The Contents. 
Generation of an Hyperbol'cal Cylindroid demon(lrated 
and the A f plication thereof for Grindhg Hyperbolical Glaf-' 
fes hinted at. Experiments lately made concerning the Moti- 
on of the Sap in trees. An Extra6l of a Lttter lately writ-^ 
ten from Viena^, ahut Damps in the Uines of Hmg^ry ^ 
and their EfftBs. A Chronological Accompt of the fever alP 
Eruptions of Mount ^Etna. A Rdation concerning 4 Wo- 
man^ net longftnce open d At Pms, having a douhle Mitvi^.An 
Accompt of 4 Books I\ JHOMty£ HQ BEES ^adratnra 
Cr culi i Cubatio Sphxrs ^ Duplicat/o Cubi ^ ConfutatadlO- 
BANNE WALLIS &c. I I. HISTORl i GERAL DE' 
ETHIOPIA A ALIA', Pelo Padre BALTHASAR TEL- 
jL'^S&c, III, AN HISTORICAL ESSAT, Endea- 
vouring to make it ErehabtCy that the LANGUAGE of' 
€niNAis the ERIMIT I') E Language 1^ by lOHN WEBB 
Mfquire, IF. AN EX AMEN of the mj of TEACHING^ 
THE LATIN fONGVE vfe alone. 
Generacio 
Corporis Gylindroidis Hyperbolic! ^ ekborandis Lenti- 
bus Hyperbolicis accommodati, Autb» Chri^opUer&' 
Wren L L ct Regiorum iEdificicrum Praefefto , nec 
nonSoc, Regic-e Sodali. 
SInt (In Fig. /. ) Hjferheh efpofitt D B, EC, g^a^ 
mm Axis iranfverfus efi B C, Centrnm n ma ex Afymfto- 
tkG P Y itmfsr Cmtrnm fit O M Ma m^angnhs nUss iffi B C, 
T tit Quare 
