1916} BRIEFER ARTICLES 319 
removed by adding a drop of concentrated hydrochloric acid to the dis- 
tilled water in which the fibers are washed just after staining. 
To secure permanent mounts showing a differentiation between 
groundwood and sulphite pulp as ordinarily found in newsprint, the fol- 
lowing modification is of value. Leave the newsprint, which has been 
reduced to pulp, in a moderately strong solution of fuchsin for some 
hours, dehydrate with absolute alcohol and transfer to benzol, transfer 
ack to a moderate solution of nigrosin in absolute alcohol, and after a 
few minutes transfer again to benzol. Superfluous stain may be washed 
out with either fresh absolute alcohol or with benzol. Mount in bal- 
sam. The groundwood shows red while the sulphite is blue. Bordered 
pits in some of the es of the sulphite show a red torus and the 
pit openings are often reddi 
Further studies are pate carried on to determine the qualities of 
this method for staining other types of material—H. N. LEE, Forest 
Products Laboratories of Canada, Montreal, Canada. 
