THE NATURE PHOTOGRAPHERS 



19 



Geological Survey, Part 3, pp. 55-56, and 

 especially in the appendix to this report 

 by Professor F. H. Knowlton on pages 

 161-162." 



Color of Timber Relation to Decay. 



Practical users of timber have long 

 known that there is a marked differ- 

 ence in the resistance ot ditterent 

 sticks to decay, one piece rotting badly 

 while another, under apparently lik^ 

 conditions remains sound. It now ap- 

 pears that this difference is due to 

 varying amounts of certain antiseptics 

 (_ir preservatives formed in the living 

 tree. In general, the darker the heart- 

 wood is, the more of these preserva- 

 tives are present and the better the tim- 

 ber will last. This applies, however, 

 only to different samples of the same 

 sort of lumber. Different sorts of 

 wood are naturally light or dark, so 

 that the most antiseptic of white cedar 

 will last three or four times as long 

 as the much darker red. But differ- 

 ent whites, or different reds, resist de- 

 cay much in proportion to their depth 

 of color. 



MISS CURTISS'S PHOTOGRAPH OF PETRIFIED 

 WOOD NEAR HER HOME IN CONNECTICUT. 



acter in my Government Report en- 

 titled, 'Tlie Xewark System of the Pom- 

 peraug \'alley, Connecticut." published in 

 21 St Annual Reixjrt of The I'nited States 



A Dog Star But Not Astronomical. 



From ]\Iiss S. G. Rice, Sandy Lake, 

 Pennsylvania, we have received a beauti- 

 ful photograph with a "happy thought" 

 for a name. Dog Star as a photograph will 

 not only attract lovers of dogs but will sug- 

 gest a simple yet novel manner of posing. 



THE DOG STAR. 



