Page:Science vol. 5.djvu/273

 Mabcw 27. 1966.1 8CTE

iag (March II), &re, Jupiler, feSlow; Kegulus, blue. The Ukked-eje view is very similar to iLe double slsr iJ Cygni. when seen with a power of about one hun- dred. StruTC rails the color ot Regulus bluish white ; hut tls color now appear* decidedly blue, or greenish blue. Si.

AcqniBitioil 111 infoiitB. I recently trieil leaching Constance A., twelve months old, to ring a eommon dome table-Lctl. Per- cetTlng the little linob on lop lo be sumebon- con- cerned, she fingered it clumsily, but could nut Ifarn to strike down on It accurately with her raised hand, though I forced her to do so many times. She made clumsy motions, but finally, half accidentally, sIik rang it. This was enough. She at once rang it repeatedly with great success. I took It away to test her memory, and the next morning she rang it immediately without snsS^sCion, but had It for a mo- ment only. She was then absent fourdays: on return- ing, she rang it at •nca. C.

Devonian strata In Montana.

The following note is written simply to place upon record the first positive identification of Devonian strata in the Hoc ky- Mountain region of Atontaua.

In 18T2 llie Hayden survey brought in. from several localities In the territory, collections of fossils, con- sisting mainly of separate valves of braehiopods em- bedded in a hard limestone. They were examined by Frof. F. B. Meek, who found that the species were mostly new, and that the genera represented were, without exception, cornniou to both the carboniferous and Devonian, while a small proportion was also rep- resented in the Silurian. In Hayden's sixth annual report, p. 4^12, Professor Meek says, " Some oC the Product!. Chonetes, and Spirifer have rather a Devo- nian look, while a very linely striated Hemipronites [s very similar to some of the Devonian types of that genus. Even the form I have referred to, H. crenis- tria, is quite as nearly like some varieties of H. chemnngensis (Streptorhynchiis chemungensia, of the fourth volume, Paleont. New York), from the Che- mung aud Hamilton groups of the New-York Devo- nian, as it is like the catbonlferous forms of H. crenis- tria." However, notwithstanding the resemblance of the fossils [o Devonian forms, he regardeil the whole collection as belonging to the lower part of the cnrbon- iferous, aa it contained no strictly Devotilaii types of corals, crinoids, or lamelllbranclis. He at the sarae time slated his belief that they were referable to a lower horiEon than the other carboniferous collections brought in from adjacent portions of Montana at the same time. The speciinens exiimlned by Professor Meek were mainly from the mountains on the south, east, and north sides of the Gallatin valley. During the summer of 1884, the writer, in company with Dr. F. Y. Hayden, had occasion to revisit a portion ot Ibis area, la a section made at a point four or five miles Dortli-west of Hamilton, running north-west- wordly from the Gallatin River, a collection of fossils was obtained from beds which at the time were sup- posed to be of lower carboniferous age, and which were colored carboniferous oji the geological map made ia 1872, Upon returning from the field, the specimens were submitted to Mr. Charles D. Walcitt of the geological survey, who Identified them as un- doubtedly Devonian. The following lists were pre- pared by him. List No. S includes lome specimens obtained from a local Ity three or four miles north- east of the point from that where those In the first list were found.

��LiBT No. 1. — Dlscina lodenais Hall (?); Strepto- rhynchus chemuiigensis Conrad ; Orthls Vanuxemi (?) Hall(?|; Choneles mucronsta Hall : Prodiictus loch- rymosus, var. limus Conrad ; Producius speeiosus; Spirjfera disjuncta Sowerby; Spirifers Engelmanni Meek; Rhyiichunella pugna Mariin; Rhyiichonella sinuaia Hall ; Khyuchonella tethys Billings { ?) ; Atrypa reticularis Linnarsson ; Ambocoelia nm- bonata Conrad ; Athyris hirsuta Hall ; Athyrls sp.(r'); Avfculopect«n : Grammysls, 3 sp. ; Moilio- morptaa; Nucula; Sdiiiodus.

List No. 2, — Streptorliynchus chemungensis Conrad; Spirifera sp.(?); Rhynchonella Horstordli Hall ( ?) ; Athyris hirsuta Hall.

Mr. Walcott says, " Of the iwenty-three species of fossils given in lists 1 and K, twelve are identical with species occurring in the upper Devonian of the Eureka district, Nevada: of the others, two are upper Devo- nian species In New- York state, and Athyris hirsuta occun at the base of the carboniferous, in the Eureka district. There Is also a specie* of Athyris too im-

Krfect for determination. The remainiog forms are nelllbrancbs Ifelonglng to five genera; and the species cliMiely resemble those of the lower carbo- niferous, of ibe Eurfika district." The latter were obtained from the upper portion of the bluff from which the speciinens were obtained.

A. C. Peai.k, U. S. gcolwjieal nuTtty.

The HaU etfeot

About a year ago Mr. Shelford lildweli published a table intended to show that the direction of the mag- netic rotation of the equl potential lines of on elec- tric current in any given metal could be inferred from the sign of the effect produced by stress upon the thermo-electric property of the metat.

Although Mr. Bldwell's attempted explanation of the former effect by means of the latter has proved entirely inadequate, the table published Is neverthe- less interesting and suggestive. It appears, however, that the law indicated in this table is nut perfectly

��ation at the Jefferson physical iaboralory, find that French cold-rolled steel would form an exception in Mr. Uidwell's table, acting In the thermo-electric test like copper, but in the other test like iron. Their ex- amination of copper and iron confirms Thomson's TMults with those metals, and, as a necessary conse- quence, Mr. Bldwell's table.

The students have examined only these three met- als as yet, but will probably extend their Investiga- tion to others. E, H. H^i.i..

CuDbrldKf, Usrch '-'0,

P.S. — We have now taken a strip of aluminium, cut two pieces from it. and tested one of these pieces for the transverse effect, the other for the thermo- electric effect. The transverse effect is like that in copper. This agrees with the result of my pre- vious examination of aluminium, but does not agree with the result obtained by Mr. Bidwell. The ther- mo-electric effect was like that in Iron. This does agree with the result found by Mr. Bidwell. Hence this specimen of aluminium, which Is not the same that I originally used, makes anolhpr eicepiion in Mr. Bidwell's table. E, H. H.

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