" 
1903] CURRENT LITERATURE a5 
geotropic reactions, so that shoots diageotropic in light become apogeotropic 
in darkness. 
Lidforss holds that the term “ psychrocliny,” introduced by Véchting, 
includes a series of phenomena which doubtless have the same ecological 
importance, but are in no wise equivalent physiologically. Unless the term 
be reserved as a physiological one for those cases in which temperature 
actually produces a modification of the geotropism, he thinks it should be 
abandone 
A NUMBER of Bulletins of the United States Agricultural Department 
deserve brief mention. 
Von SCHRENK*® discusses among other subjects the relation of water to 
the decay of timber, how timber is seasoned, seasoning tests with lodgepole 
pine and oak, and tests with telephone poles. 
GRAVES AND FISHER treat of the woodlands of southern New England. 
Improvement cuttings, reproduction cuttings, platting, pruning, protection 
of the woods and other subjects are well handled. 
In another bulletin VoN SCHRENK * has investigated the cause of the blue 
color of dead wood in P2zus ponderosa (which he finds due to the blue fungus, 
Ceratostomella pilifera (Fr.) Winter), the effect of coloring on the value of the 
ood, the reason for the decay of wood and how prevented, and whether it 
would be possible to use the dead wood before it decays. The bark beetle 
(Dendroctonus ponderosae) spreads the fungus, therefore it is recommended 
that the dead wood be removed at once, for standing beetle-infested trees 
serve to spread the insect. 
HERTY”* shows that an improved method of turpentine orcharding will 
increase profits sufficiently to warrant its adoption by any turpentine oper- 
ator.— H. N. WHITFORD 
VAN WISSELINGH, in his earlier papers upon karyokinesis in Spirogyra, 
devoted his attention to the nucleolus and the nuclear net-work, In the 
fourth paper” of the series he deals with the nuclear membrane, the spindle, 
and the walls of the vacuole. Sfirogyra triformis, a species with thin walls 
73 VON SCHRENK, HERMANN, on by IlILL, REYNOLDs, ara of timber. 
Bull. No. 41. Bureau of Forestry, U. S. Dept. of Agric. pp. 48- A/s. 28. figs. 16. 1903. 
GRAVES, H. S. and FIsHER, R. T., The woodlot: a handbook for owners of 
woodlands in pcs New Paghand. Bull. No. 42. Bureau of Forestry, U. S. Dept. 
of Agric. pp. 89. f/. g. fig. 30. 1903. 
*5VON SCHRENK, HERMANN, The “bluing” and the “red rot” of the western 
yellow pine, with special reference to the Black Hills forest reserve. Bull. No. 36. 
Bureau of Plant Industry. U.S. Dept. of Agric. pp. 40. pls. 7g. 1903. 
°° HERTY, C. H., A new method of turpentine orcharding. Bull. No. 40, Bureau 
of Forestry, . S. Dept. of Agric. pp. 43. pls. 15. figs. §. 1903. 
*7 WISSELINGH, C. VAN, Untersuchungen iiber Spirogyra. Vierter Beitrag zur 
Kenntniss der Karyokinese. Bot. Zeit. 60: 115-138. f/. 5. 1902. 
