INDEX. 
987 
T. 
Thaumatocrinus renovatus, 919. 
Thomson (J. J.). On the Determination of the Number of Electrostatic units in the Electromagnetic 
Unit of Electricity, 707. 
Thorpe (T. E.) and Schorlemmer (C.) (see Schorlemmer). 
Tomlinson (H.). The Influence of Stress and Strain on the Action of Physical Forces, 1.—Part I. 
Moduli of elasticity, 2; Young’s modulus, 2; Hooke’s law, 12; discussion of Wertheim’s experi¬ 
ments on elasticity, 14; effect of permanent torsion combined with traction, 17; effects of permanent 
torsion and elongation on the modulus of rigidity, 24; elasticity of volume, 29; permanent alteration 
of density produced by longitudinal traction, 30; relation between moduli of elasticity and inter- 
molecular distance, 32; influence of an electric current and of magnetism on the torsional rigidity 
of metals, 33; critical points, 36; summary of Part I., 36. Part II. Electrical conductivity, 39; 
temporary alteration of electrical conductivity produced by longitudinal traction, 39; influence of 
permanent extension on the same, 64; effect of compression on electrical conductivity, 65; of stress 
applied in a direction transverse to that of the current, 66; of stress applied equally in all directions, 
70; permanent alteration of resistance produced by longitudinal traction, 78; critical points, 80; 
permanent alteration of specific resistance caused by stress, 96; alteration of specific gravity pro¬ 
duced by permanent extension, hammering, and permanent torsion, 107; effect of cooling suddenly 
on the specific resistance of steel, 109; recovery of electrical conductivity produced by time in wires 
which are in a state of strain, 110; influence of permanent strain on the change of electrical con¬ 
ductivity produced by alteration of temperature, 112; further discussion of Wertheim’s experiments 
on elasticity, 128; alteration of electrical conductivity produced by magnetization, 133; effect of 
temporary stress on the same, 137; effects of permanent longitudinal extension, of torsion, and of 
tempering on the same, 141; attempt to determine relations between the alteration of electrical 
resistance produced by any magnetizing force, the force itself, and the magnetism induced by the 
force, 142; effect of altering the strength of the bridge current on the change of resistance produced 
by any magnetizing force, 146; effect of longitudinal magnetization on electrical resistance, 148; 
discussion of Stewart’s and Schuster’s experiments on the alteration of the electrical resistance of 
copper by magnetization, 157; effect of annular magnetization on electrical resistance, 160; discus¬ 
sion of Auerbach’s experiments, 163; remarks on the altei’ation of resistance which is produced by 
magnetization, 166; relation between the rotational coefficient of metals and the alteration of resis¬ 
tance produced by mechanical stress, 167; relation between electrical resistance and viscosity, 168; 
summary of Part II., 169. 
Tliylacoleo, 575, 639 (see Owen). 
U. 
Unit of electrical resistance , 173, 223, 295 (see Rayleigh and Glazebrook). 
V. 
Viscosity , relation between, and electrical resistance, 168. 
W. 
Ward (H. M.). On the Morphology and Development of the Perithecium of Meliolia, a Genus of 
Tropical Epiphyllous Fungi, 583; description of plates, 597, 
