124 Scientific Intelligence. 
in the ordinary way. After again washing, a weak solution of gum ara ye 
bic is spread over the plate which is then dried and varnished. : 
that although the washing of the sensitized plate should be begun im 
ace id. If under ex hasten the development by increasing. 
the amount of pyrogallic acid and subsequently of nitrate of silver, whet 
the details are well out ew experiments gives the operator perfect 
not steady hands, the use of a shallow glass dish in developing as recom 
mended above will be found of great advantage, especially when the pro 
cess is prolonged. 
