SEPTEMBER, 1893. 
Evolution and classification. ! 
CHARLES E. BESSEY. 
AS we have gathered up the scattered masses of botanical 
owledge, laboriously wrought out by many isolated work- 
erent units of medsurement. With the increasing special- 
80 Noticeable year by year there isa corresponding — 
of coordination of work. To this lack of coordination, 
r We May make some im rovement. 
All botanical know , 
Son. The facts of histology, morphology and physi- 
Y are of great biological importance, but the gr pig gore of 
oly MOBical facts js that the world is peopled with living 
eh the mor 
“ication of all t 
are these lie 
ird of a century since a great light was 
ited upon all i 
© doctri © of evo] 
Petoe vec Presidential address before Section G of the American — 
Vol, xyey vancement of Science, Madison meeting, August, 1893. : 
XVIHI~No, 9. coe 
