172 THE
ARCHITECTURE OF HUMANISM
isnot
merelythattheleastworthyfactsarestudiedmost, and that the stress fallsrather on what
ishistoriallyilluminating than on what is beautiful.Theprejudiceis moreprofound. Forevolution
wasschooled in
the study of biology;and
historicalcriticism, when it deals in values at all, tends
un-consciously toimposeonarchitecture thevalues
ofbiology.
Renaissancearchitectureisblamed,inthegeneral, because it is sdf-guided and'arbitrary';yetitiscondemned,in
theparticular,
bytheunjustdooms
of'necessary'law. Let us take a typicalpresentationofthestyle,andseehowthisoccurs.
Thearchitectureofthe Renaissance, we are
told,and rightly, falls
into three fairly distinct periods.There
is the period of the Florentine Renaissance—
^the period of thequattrocento—tentative, experi-
mental,hesitating,
withacertainnaivequalitythatmakes for
charm but hardly for accomplishment:theperiod ofwhich Brunelleschi
istheoutstandingfigure. Ofthismanner
ofbuildingthePazziChapelisthe
earliestpureejcample,andthe'Carceri'Churchof
GuilianodaSangallo,
atPrato, oneofthelatest.Thisisthe
periodofimmaturity.The second period
is that of Bramante and ofRaphael. Itis much more sure
of itself; itsaimis clearly
defined and
supremely achieved. Thetentative Brunelleschian
charmhasvanished, anda
moreassuredand
authoritative
mannerhastakenits