﻿164 Transactions. — Miscellaneous. 



order to produce a passable picture. It may be observed that my pictui'es 

 are entirely free from blemishes of this kind, and this is attributable solely to 

 close attention to cleanliness, and to care in the mechanical operations. Of 

 coiirse there are cases in which the most careful operator must be content 

 to put up with imperfections ; but I am assuming the case of one who has 

 it in his power to control circumstances. As a last suggestion I would add 

 that perfect calmness and deliberation in all stages of the work are in the 

 liighest degree necessary, anxiety and hxirry being fruitful sources of failure. 



