Miscellaneous Intelligence. 247 



SCIENTIFIC INTELLIGENCE. 



1. On Temporary Set ; by C. Barus. — Following the sugges-i/ 

 tions of my last paper* I have since been able to map out the 

 occurrence of what I shall call temporary set, distinguished from 

 permanent set inasmuch as the former may be shaken out of a 

 metal by molecular agitation (without heat, as for instance by 

 magnetization of iron). The latter cannot, of course, be shaken 

 out of the metal. Temporary set (d6) is instantaneously 

 imparted ; it begins with the zero of twist (#), increasing at an 

 initial rate d0;'0='OO4, the rate gradually diminishing to zero 

 when the (elastic) obliquity of the external fibre of the twisted 

 wire exceeds *002 radians, after this temporary set becomes 

 unstable, passing into permanent set. The maximum amount of 

 temporary set may be estimated as -0015 of the maximum twist 

 within the elastic limits. Its variation depends not on the 

 impressed strain but on the antecedent strain, i. e., the strain 

 between two successive molecular agitations and which may lie 

 on both sides of zero. 



2. Some new rock-types. — Kenyte. This name has been 

 applied by J. W. Gregory to " liparitic representatives of an oli- 

 vine-bearing nepheline syenite, consisting of anorthoclase pheno- 

 crysts with or without some augite and olivine phenocrysts and 

 a glassy or hyalopilitic groundmass which varies in color from 

 grayish green to a deep sepia-brown. Aegyrine, if present, 

 occurs in small granules ; senigmatite and quartz are absent." 

 The rocks occur as surface lava flows on Mount Kenya in East 

 Africa. They are supposed to be closely related to pantellarites 

 but no analyses are given of them, and as the glassy base is 

 stated to gelatinize with acid and to contain abundant soda, it 

 is difficult to see why they are not glassy phonolites especially 

 as they are held to be surface representatives of the nephelite 

 syenite of the central core. — Q. J. Geol. Soc, lvi, p. 211, 1900. 



Kedabekite. E. von Federov has given this name to a 

 rock occurring in dike form in the vicinity of the Kedabek 

 mines in the Government Elisabethpol, Transcaucasia. It is 

 very fine granular, of a dark gray with a^tone of green. It con- 

 sists of basic plagioclase, a lime-iron garnet ("aplome") and a 

 strongly pleochroic pyroxene called violaite (conf. p. 86 of this 

 volume). The type is held to be remarkable in that it unites 

 such different kinds as augite-garnet rock and diabase. The 

 occurrence is in close relation with an augite-garnet rock and is 

 held to be a local facies of a neighboring diabase. The analysis 

 by A. Kupffer gave : 



Si0 2 A1 2 3 Fe 2 3 FeO MnO CaO MgO Na 3 K 2 Ign. 



1 44-64 18-54 6'63 4"65 '09 2217 2-52 -80 -05 -18 = 100-27 



2 44-11 19-38 5 17 5-44 — 21*98 2'90 -50 '13 -26= 99'87 



The type is mentioned as also occurring in the mining district of 

 Bogoslowsk. — Separate ; conf. also Annuaire geol. et min. de la 

 Hussie, iv, Liv. vi, p. 137. l. v. p. 



-This Journal, xi, 1901, p. 97. 



