Parker-Photomechanical Changes. 



LIGHT. 



DARK. 



crrv. 



g; clem 



clrtn.: 



cl.sn 



nlsn. 



m.b. 6a. 



nlrtn. 



.fbr.r 



3. 



rhh. 



2. 



cl.rtji: 



-:.:... cl.sn. 





G.HP.del. 



i, Me'.s". iith.te'i. 



