62 The N.Z. Journal of Science and Technology. [Jan. 
RECENT PUBLICATIONS. 
PHYSICS. 
Farr, C. C. A Magnetic Survey of the Dominion of New Zealand and some of the 
Outlying Islands for the Epoch 30th June, 1903. Pp. i-iv, 1-66, and addendum, 
figs., 18 maps ; 4to ; Lands and Survey Dept., Wellington, N.Z., 1917. 
CHEMISTRY AND METALLURGY. 
Donovan, W. The Distribution of Titanium, Phosphorus, and Vanadium in Taranaki 
Ironsand. Trans. N.Z. Inst., vol. 48, pp. 503-7, 1916. 
An analysis of Taranaki ironsand from Patea and New Plymouth, both in the 
natural state and after magnetic separation. 
Jenkinson, S. H. The Manufacture of Iron and Steel in New Zealand. Trans. 
N.Z. Inst., vol. 48, pp. 508-13, 1916. 
An account of the main sources of iron-ore in New Zealand, with estimates of 
the cost of production of pig iron from Parapara ore and Taranaki ironsand. 
Lucas, A. H. S. An Efflorescence on some New Zealand Kelps. Proc. Linn. Soc. 
N.S.W., vol. 41, pp. 676-79, 1917. 
MECHANICS AND ENGINEERING. 
Birks, L., and Webb, Eric. Investigation into the Resistance of Earth Connec¬ 
tions. Trans. N.Z. Inst., vol. 48, pp. 464-81, 1916. 
An account of experiments made upon the resistance of earth connections 
to the Lake Coleridge transmission-lines. 
Parry, E. Permissible Sag. Pp. 12, roy. 8vo, Public Works Dept., Wellington, 
N.Z., 1915. 
Table and formulae correlating the dip, span, and temperature of bare, triple- 
braided, and rubber-insulated coyiper and aluminium cables, within the usual range 
of span and temperature. 
Parry, E. Resistance to the Flow of Fluids through Pipes. Trans. N.Z. Inst., 
vol. 48, pp. 481-89, 1916. 
An analysis of the resistance offered by rough pipes to the flow of fluids through 
them in terms of the diameter of the pipes, the velocity and kinematic viscosity 
of the fluid, based on the theory of fluid friction and Stanton’s experiments. 
Wilson, W. Hydro-electric Power in New Zealand. Jour. Inst. Elect. Eng., vol. 54, 
pp. 275-91, 1916. 
An account of the water-power sources of New Zealand, with particulars of 
the developments already carried out. 
BOTANY AND PALAEOBOTANY. 
Aston, B. C. The Botany of Tapu-ae-nuku, New Zealand. Roy. Bot. Gardens Kew, 
Bull, of Mis. Inform., No. 7, pp. 182-84, 1916. 
Aston, B. C. The Vegetation of the Tarawera Mountains, New Zealand. Journ. 
Ecol., vol. 4, pp. 18-26, pis. iii-v, 1916. 
Cockayne, L. A Montane Rain-forest. (Review of F. Shreve. A Montane Rain¬ 
forest : a Contribution to the Physiological Plant Geography of Jamaica. Carnegie 
Inst., Wash. Publ., 1914.) Plant World, vol. 18, pp. 168-70, 1915. 
The resemblances and differences between Jamaican montane rain-forest and 
ordinary New Zealand rain-forest are briefly discussed. 
Chamberlain, C. J. Prothallia and Sporelings of Three New Zealand Species of 
Lycopodium. Bot. Gaz., vol. 63, pp. 51-65, 1917. 
A short account of the prothalli of Lycopodium laterale , L. scariosum, and 
L. volubile, and of the stele in the sporeling of the two last-named species. 
Gwynne-Vaughan, D. T. Observations on the Anatomy of the Leaf in the Osmund- 
aceae. Annals of Botany, vol. 31, pp. 487-93, 1916. 
Amongst other species, the New Zealand Todaea barbam, T. superba, and 
T. hymenophylloides are dealt with. 
Gwynne-Vaughan, D. T. On some Climbing Davallias and the Petiole of Lygodium. 
Annals of Botany, vol. 31, pp. 495-507, 1916. 
Although the New Zealand Lygodium acticulatum was not investigated, the 
paper cannot be neglected by New Zealand botanists. 
