December 15, i§g3.] 



SCIENCE. 



335 



order to measure the strength of the magnetic field a 

 small coil was suspended by a bifilar-suspension close 

 to the capillary tube, and from the deflection, when a 

 known current was passed through this coil, the 

 strength of the field was calculated. The results ob- 

 tained by this method were also compared with those 

 found by the rotation of polarized light in a piece of 

 heavy glass, and by means of a small induction coil 

 which could be rapidly moved out of the field. 



— Macmillan & Co. have nearly ready for publication, 

 under the title '-Pain, Pleasure and iEsthetics," an essay 

 by Mr. H. E. Marshall concerning the psychology of pain 

 and pleasure with special reference to aesthetics. Some 

 parts of the argument have already been presented in the 

 pages of Mind, and the author acknowledges special in- 

 debtedness to the late Prof. Croom Eobertson for sym- 

 pathy and encouragement. 



— Some interesting investigations on the vitality of 

 the cholera organisms on tobacco have been made by 

 Wernicke [Hygien: Rundachau, 1S92, No. 21), according 

 to Nature. Small pieces of linen soaked in cholera 

 broth-cultures were rolled up in various kinds of tobacco, 

 and the latter were made into cigars. At the end of 

 twenty-four hours only a few bacilli were found on the 

 linen, and none on the leaf. On sterile and dry tobacco 

 leaves, the bacilli disappeared in one-half to three hours 

 after inoculation. On moist, unsterilized leaves ihey 

 disappeared in from one to three days, but on moist and 

 sterile leaves in from two to four days. When intro- 

 duced into a five per cent, tobacco infusion (10 grams of 

 leaves to 200 grams of water), however, they retained 

 their vitality up to thirty-three days; but in a more con- 

 centrated infusion (one gram of leaves to two grams 

 of water) they succumbed in twenty-four hours. When 

 enveloped in tobacco smoke, they were destroyed, 

 in broth-cultures, as well as in sterilized and unsterilized 

 saliva, in five minutes. Tassinari, in his paper. 



"Azione del fumo di tobacco Sopra alcuni microrgan- 

 ismi patogeni" (Annali deli Islituto d'Igiene, Rome Vol. 

 I., 1 891), describes a series of experiments in which 

 he prepared broth-cultures of different pathogenic 

 microbes, and conducted through them the smoke from 

 various kinds of tobacco. Out of twenty-three separate 

 investigations, in only three were the cholera organisms 

 alive after thirty minutes' exposure to tobacco fumes. 

 But in actual experience the apparent antiseptic prop- 

 erties of tobacco have not unfrequently been met with ; 

 thus, during the influenza epidemic in 1889, Visalli 

 {Gazelta degli Ospedali, 1889) mentions the remarkable 

 immunity from this disease which characterized the 

 operatives in tobacco manufactories; that in Genoa, for 

 example, out of 1,200 workpeople thus engaged, not 

 one was attacked; whilst in Rome the number was 

 so insignificant that the works were never stopped, 

 and no precautions were considered necet^sary. 



— Prof. Felix Klein, of the University of Gottingen, 

 after attending the Chicago Congress of Mathematics last 

 August, delivered a two weeks' course of lectures on 

 modern mathematics at Evanston, 111. , before members of 

 the Congress. These lectures will be published (in 

 English) substantially as they were given, with the addi- 

 tion of the interesting historical sketch of the develop- 

 ment of mathematics in Germany during the present 

 century (up to the year 1870), recently contributed by 

 Professor Klein to the work "Die deutschen Universi- 

 tiiten." The lectures present, within certain limits, a 

 general view of the most important advances that have 

 taken place in mathematical thought and research during 

 the last twenty-five years. Only the rare ability, possessed 

 in so eminent a degree by Professor Klein, for taking hold 

 of the most characteristic features of a given subject and 

 presenting it vividly to his hearers from various points of 

 view, could make it possible to give so much in so small a 

 compass. 



Jndigesfm 



Horsford's Acid Phosphate 



Is the most effective and agreeable 

 remedy in existence for preventing 

 indigestion, and relieving those dis- 

 eases arising from a disordered 

 stomach. 



Dr. W. "W. Gardner, Spring- 

 field, Mass., says, "I value it as an excel- 

 lent preventative of indigestion, and a 

 pleasant acidulated drink when proper- 

 ly diluted with water, and sweetened." 



Descriptive pamphlet free on application to 



RuMFORD Chemical Works, Providence, R. I. 



Beware of Substitutes and Imitations. 



For sale by all Druggists. 



[Free of charge to all, if of satisfactory character. 

 Address N. D. C. Hodges, 874 Broadway, New 

 Vork] 



f obtaining the following back num 

 bers of The. Auk : One copy each of Oct., 1885; July 

 1886; January, 1887; July, 1887; April and July, iSg; 

 and two copies each of the following: January, i88f 

 Oct. 1886; Oct , 1887; July, 1888; January, 1889; Jan 

 uary, i8go. My own contributions in them only art 

 required; otherwise the copies need not be perfect 

 I have in exchange for them two vols, (zoology) 

 Me.^. Bound'y Surveys (col. plates) or complete set 

 of English reprints of "Osteology of Arctic Water 

 Birds, etc," (q parts, 24 lith. plates); or other rare 

 scientific reprints of any subject required. ' ' 

 dress Dr. Shufeldt, Takoma, D. C. 



For ^ale. — The first eleven volumes of Crooke's 

 Quarterly Journal of Science, 7 vols, ist series, 4 

 vols. 2nd series, beautifully bound, half morocco, 

 as good as new, for S30. John J. Jarmey, 93 India- 

 nola Place, Columbus, Ohio. 



For Sale.— A very fine telescope, length extended, 

 twenty-five inches, closed, seven inches. Power 

 cwenty-five times. Good as new. Cost $25.. 

 Will sell for the best cash offer. B. S. Bowdish, 

 Box 165, Phelps, N. Y. 



For Sale or Exchange for last editions of Standard 

 Works on Vegetable Anatomy or Phvsiology 

 Practical Zoology, Marshall & Hurst; Elements o 

 Embryology, Foster & Balfour; Zoology, Macalis 

 ter; Guide to the Study of Insects, Packard ; Geolog- 

 ical Studies and Shall We Teach Geology, Winchell. 

 Also have duplicates of E.Kperiment Station pub- 

 lications which would like to exchange for any n< t 

 in my file. L. R. Jones, Burlington, Vt. 



For exchange.— Skins of Aegialites nivosa, Ereu- 

 netes occidentalis, Aunnodramus Arldingi. A. 

 rostratus, Chamara fasciata henshawi, etc., for 

 or foreign skins with full data. Send lists. 

 A. W. Anthony, 2043 Albatross St., San Diego, Cali- 



forcia. 



Wants. 



\A/ ANTED.— Books or information on the micro- 

 '» soopical determination of blood and hair. Also 

 reports of cases where hair has played an import- 

 ant part in the identification of an individual. Ad- 

 dress Maurice Reiker, 206 N. First Ave., Marshall- 

 town, Iowa. 



A GEOLOGIST thoroughly conversant with the 

 '^ geology ot the Southern States desires an en- 

 gagement. Has complete knowledge of the eco- 

 nomic geology of Iron, Coal, Lignite, as well as 

 Clay and Kaolin. Five years' experience with 

 Geological Surveys. Address K., 509 West Sixth 

 Street, Austin, Texas. 



\X7ANTED.— Tuckerman's Geneva Lichenum and 

 '' Carpenter on the Microscope, Wiley's In- 

 troduction to the Study of Lichens. State price 

 and other particulars. Richard Lees, Brampton, 

 Ont. 



\J/ANTED.— Icones Muscorum by W. D. SuUi- 

 ''' vant, with or without Supplement, but both 

 preferred. Address, stating price and condition 

 of books. Dr. G. N. Best, Rosemont, N. J. 



\X/ANTED.— A copy of Mascart & Joubert's Les- 

 *'' sons in Electricity and Magnetism, Vol. I. Ad- 

 dress R. W. Clawson, Vanderbilt University, Nash- 

 ville, Tennessee. 



pHEMIST.— Graduate of a polytechnical school, 

 and studied photographic chemistry in Ger- 

 ly and Austria. Situation teaching or in ana- 

 lytical or experimental laboratory. M. B. Punnett, 

 Rochester, N. Y. 



