THE GROWTH OF ETCH- FIGURES 
By WILLIAM HARVEY MCNAIRN. 
INTRODUCTORY. 
I. EXPERIMENTAL: 
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2PACIG COMosion Of SpodiimMieNne. 2.) i eek le ec hog ee ae eee 
So Alkalene corrosion OfSpoduimene:).4 254 Fes bey eh ls aes Sees Se 
Frere ACIGECOLLOSIOMUOL CIO PSIG E/mysiae eekly oe ene eel oh sak ora osetia aon SET 
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COyM DIES On) CNETE MNO DINAGCOIG 5220029 ass is sraisic's du b-0 assem ee fate Odes 
Epics ON CHE OLEROMINACOIG yt ea ees oe ius Cols a is hy oa es» ea 
(@)epitstoneeherontnodome ss ween core ee cel che sean a oakiee oan eens 
CPDL HOM EMe DASE Ts fab en emia ane Shey eos Ra Dh Lyi 
PU Katie COLrOsIONGON UO PSIGEs ohare Bin Sides «dpe dv debe oa eae OR 
II. THEORETICAL: 
I. 
SPATE OUMAOMGLID IEPs eh ary etacice Meter ToT ec ene oles Rone oe 
peUME CLOMUMG OM IES DIE ye sok Ky elon on ied An ced a aoe a 
. The nature of the figure-faces............. 
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(a) the nature-and’ classification of beaks:...........0..+422s8eu-- 
(Oath ercracaaiea ica res recreate ce ees erp ar tee ARLE tal NOL ge ee eae 
EAU Me IOLIMAN DEA aes so Sosa oe Se ee Cee ae eee Tas 
SRE VEU CIE GaSe. es dil eae as ha ata oS eee tele 
