A note in regard to the composition of 
the papers used in this book. 
Noticing the superior enduring qaualities. 
of thellparts of this work published in 
1878, I sent small samples to H. N. Lee, 
the paper technologist, for analysis. His 
report was as follows: 
"1874. 60% rag (mostly linen) 
20% ground wood 
20% chemically cooked 
straw and wood 
"1878. 80% rag (mostly cotton) 
No ground wood 
20% chemically cooked 
straw and wood 
"Both papers contain considerable 
inert clay as a filler." 
It is an impressive demonstration of the 
deleterious effect of ground wood on the 
durability of scientific paper. 
Edgar Anderson 
November, 1935 
