302 Field Notes. 
Tortula cernua, seeing that it was in the immediate district 
that Mr. Webster first found the plant in 1900, and that in 
its only other recorded station at Conisborough, in 1909, it was 
growing on lime debris in association with Leptobryum. The 
suggestion was promptly utilised and many old discoloured 
capsules of the Yortula were found, which had been previously 
overlooked, owing to the plants being buried in a dense growth 
of Funaria hygrometrica, the oblique gibbous capsules of the 
two species having some superficial resemblance. A beautiful 
display of this rare moss has since developed, several square 
yards of ground being toned with the red sete of the young 
sporophytes. The lime on which it grows is sedimented from, 
water pumped from a neighbouring coal mine, after use in 
steam condensers. When tested at the outfall to a cooling 
pit, this condenser waste had a temperature of 130°F. The 
overflow runs away as a small open stream to the Cock beck. 
Alkaline earths in solution are precipitated when carbonic 
anhydride is dissipated by heat, the troughing, cooling pit and 
stream, bed being thickly coated with the white deposit, which 
is from time to time cleared out and dumped on some adjoin- 
ing rough pasture. The Tortula and Leptobryum are restricted 
to damp places near the stream and some depressions where 
water is held up by the underlying clay. Another station has 
been found about two miles distant, at the base of a wall on 
the Permian Limestone. Here too, it is associated with 
Funaria and Leptobryum, the permanently humid conditions 
being evidenced by a plentiful growth of Marchantia poly- 
morpha L.—W. H. BURRELL. 
-O:; 
Elements of Forestry. By F. F. Moon, B.A., and N. C. Brown, B.A. 
London: Chapman and Hall, pp. xvii. + 392, 8s. 6d. net. As the 
authors point out, American forestry is of comparatively recent develop- 
ment. The first forest reserves were set aside by President Harrison 
about 20 years ago, but the chief credit for its development is due to 
President Roosevelt, who, during his term of office, raised the acreage 
from 46 millions to 194$ millions, and during this time forestry adminis- 
tration was greatly perfected. Naturally the Americans are still far 
behind some European states where State forests, e.g., in Switzerland, 
have been developed from very early times. Nevertheless, American 
forestry has advanced with great rapidity, and this work has been written 
for students in schools of agiculture and forestry to meet this ‘ educational 
awakening.’ The authors deal clearly and simply with practically every 
phase of forestry, and though certain aspects are only briefly treated, 
students will find it a compact and convenient summary of the leading 
principles. Part 1 deals with forestry in America and abroad ; the tree, 
its functions and requirements, silvics and silviculture, improvement, 
regeneration, protection, mensuration, lumbering, utilization, wood 
technology and preservation, economics and finance. Part 2 deals with 
studies of the forest regions, and is illustrated by a map showing the 
natural forest regions of North America. There is an Appendix of rules 
and tables, and a glossary and short index, the latter being largely a 
classified list of the subjects mentioned in the full table of contents. The 
work is illustrated by 65 well selected photographs. 
Naturalist. 
