( 197 ) Numb. i4§ 
PHILOSOPHICAL 
TRANSACTIONS. 
June lo, 1683. 
The CONTENTS. 
I. jln JbfiraU of a Letter from M>. Anthony Leewenhoeck 
Delft toMr. R, H. concerning the appearances offeve-^ 
ral W oods und their Y^ffels as obferved in ^ Micro icope- 
2 A Theory of the Variation of the Magnetical Compafs * 
by themojl Ingenious Mr. Edmund Halley Fellow of the 
Royal Society. 5. Jn Account of a Book^^ylz. Wilhelmi ten 
RhyneM. D. &c« Tranfifalano Daventrienfis ^ ^^^z-^^^- 
tio de ATHI^n IDE. Mantifla Schematica: de 
AC VP FNCTFK^A. EtOrationes tres, i. D^Chynii^E 
^ Botanicc^ antiquitate & dignitate. 2, Be Phyfiognotiiia, 
3. 2)^ Monftris. LondinimS^, 1683. 
AhftraB of a Letter from Mr. Antho- 
ny Leewenhoeck 0/ Delft to Mr. R. 
H. concerning the appearances of fey era! 
JVoods^and their Vefjels. 
The Treface to the Letter, 
T am not ignorant th^ theprefentfubjeft has been leam- 
^ ediy treated of* by the ludicious MalpighiussindDr,' 
Dd N.Greiv 
