788 



McLeod — MacMahon. 



tric charges acquired in high vacua by insulated 

 K-salts & other radioactive substances, 19 S. 

 (3, 09). — Intensity of the earths penetrating 

 radiat. at different altitudes & a secondary ra- 

 diat. excited byit*), 9 S. (5, 11). — Relative in- 

 tensities of the earths penetrating radiat. on 

 land & sea, 7 S. — Diffus, of actinium emanat. 

 & the active deposit produced by it, HS. (6, 12). 



London, Chem. Soc. Journ,: He, its product. 

 & uses, 25 S. (117, 1920). 



London, Roy. Soc. Phil. Trans.: Electrical 

 conductivity in gases traversed by cathode 

 rays, 30 S. (195, 1901). 



London, Roy. Soc. Proc. : Electrical con- 

 ductivity in gases traversed by cathode rays, 

 4 S. (66, 1900). — The series lines in the arc 

 spectrum of Hg, 13 S. — The constitut. of the 

 Hg green line A = 5461 A. U., & on the magne- 

 tic resolut, of its satellites by an echelon gra- 

 ting, 8 S. (87, 12). — A fluorescence spectrum 

 of iodine vapour, 7 S. (88, 13). — The Hg green 

 line A = 5461 resolved by glass & quartz lum- 

 mer plates & on its Zeeman constituents *), 

 13 S. (90, 14). — The fluorescence of iodine va- 

 pour excited by ultra-violet, 7 S. — lonisat. po- 

 tentials of Hg, Cd & Zn, & the Single- & many- 

 lined spectra of these elements*), 7 S. (91, 15). 



— The single-line spectra of Mg & other me- 

 tals & their ionising potentials, 8 S. — The ioni- 

 sat. Potentials of Mg & other metals & on their 

 absorpt. spectra, 10 S. — On the Bunsen flame 

 spectra of metallic vapours'), 7 S. — The ioni- 

 sat. of metallic vapours in flames®), 18 S. (92, 

 16). — An investigat. of extreme ultra violet 

 spectra, with a vacuum-grating spectrograph'), 



16 S. — The absorpt. spectra & the ionisat. 

 Potentials of Ca, Sr, & Ba "j, 7 S. — Va- 

 cuum arc spectra of various elements in the 

 extreme ultra-violet ") "), 17 S. (95, 

 19). — Arc spectra in vacuo & spare spectra 

 in He of various elements ^'') ^^), 14 S. — Spark 

 spectra of various elements in He in the ex- 

 treme ultra-violet^*), 6 S. — Note on vacuum 

 grating spectroscopy, 10 S. (98, 21). — The 

 spectrum of ionised K, 9 S. — On the ref rac- 

 tive indices of Hg- & Tl-vapours, 9 S. — On 

 the emiss. & absorpt. of spectra of Hg^*), 



17 S. — On the structure of the Balmer series 

 lines of Hi«), 10 S. (100, 22). — On the struc- 

 ture of the line A. = 6708 A. of the isotopes of 

 Li 11), 7 S. (101, 22). — On the absorpt. of 

 5460' 97 A. by luminous Hg-vapour^i) "), 

 13 S. — On the fluorescence of sesculin^'), 12 S. 



— On the excitat. of characteristic X-ray from 

 light elements 1«), 22 S. (102, 22/23). 



Phil. Ma!?. : Induced radioactivity excited 

 in air at the foot of waterfalls, 10 S. — Experi- 

 ments on the electrical conductivity of atmo- 

 spheric air, 9 S (5, 1903). — The radioactivity of 

 metals generallyi), 7 S. (6, 03). — The radio- 

 activity of Pb & other metals, 19 S. (14, 07). — 

 The radioactivity of K & other alkali metals 3), 



18 S. (16, 08). — The intensity of the earths 

 penetrating radiat. at different altitudes & 

 a secondary radiat. excited by it*), 8 S. (22, 

 11). — The diffus, of actinium emanat. & the 

 active deposit produced by it, 10 S. — The re- 

 lative intensities of the earths penetrating ra- 

 diat. on land & sea, 7 S. (24, 12). — Measure- 

 ments of the earths penetrating radiat. with a 

 Wulf electrometer *) 12 S. — The electrical con- 

 ductivity imparted to liquid air by alpha rays*), 



19 S. (26, 13). — The absorpt. spectrum of Zn 

 vapour, 3 S. (28, 14). — The mobilities of ions 

 in air at high pressures*), 7 S. — The delta ra- 

 diat. emitted by Zn when bombarded by alpha 

 rays^*), 12 S. — The ionizat. tracks of alpha 



rays in H 2"), 7 S. — Residual ionizat. in gases ^i), 

 13 S. — The residual ionizat. in air enclosed in 

 a vessel of ice **), 7 S. — The ultra violet spec- 

 trum of elementary Si ^^), 3 S. — The inf ra- 

 red emiss. spectrum oj the Hg^*), 13 S. — The 

 absorpt. spectra of Hg, Cd & Zn vapours"^), 

 6 S. (30. 15). — On the ultraviolet spectra of 

 Mg & Se"), 11 S. — On fundamental frequen- 

 cies in the spectra of various elements i*), 11 S. 

 (36, 18). — On the permeability of thin fa- 

 brics & films to H & He^s), 9 S. (40, 20). 



Physik. Zeltschr. : Radioaktivität des Pb 

 & anderer Metalle, 1 S. (8, 1907). — Radio- 

 aktivität V. K & anderen Alkalimetallen, 3 S. 

 — Bemerkg. üb. d. Radioaktivität gewöhnl. Me- 

 talle & üb. d. durchdringgskräftige Strahlg. aus 

 d. Erde, 3 S. (9, 08). 



Zeltschr. t, physik. Chemie: Ostwald: Elektr. 

 Leitfähigk. in Gasen, die v. Kathodenstrahlen 

 zurchsetzt sind, 33 S. (37, 1901). 



Außerdem zahlr. Abhdlgn. üb. Spektro- 

 skopie& Radioaktivität (Phys.Rev., Phil. Mag., 

 Royal Cana dian Instit. Proc). 



Mit ') E. Burton, ') V. Pound, =) W. Kenncdey- 

 *) E. Macallum, ') A. Mc. Leod, ') J. Hendereon, ') A 

 Thomson, *) D. Keys. ») R. Lang, ") J. Young. ") D 

 Ainslie, ") D. Füller, ") H. Ireton, ") A. Lewis, ") W. 

 Shaver, ") P. Lowe, i') F. Cale, ") M. Clark, '•) C, 

 Found ") H. Mercer, ") C. Treleaven, ") H. Murray 

 ") E. Edwards, ") R. Deanle. 



IV McLeod, Clement Henry, B. Sc, 

 M. E. Montreal; seit 1881 Prof.. Geodä- 

 sie, Univ., Montreal, * 1851, Jan. 20, 

 Cape Breton, Canada. 



Elem. descriptive geometry, 2. Aufl., New 

 York 1908. 



Canada, Roy. Soc. Proc. a. Trans.: Differ. of 

 temp. betw. Mt Royal & Mc Gill College Ob- 

 serv. (m. H. T. Barnes), 5 S. (1, 1907). — Local 

 temp. forecasting by differ. in temp. betw. Mt. 

 Royal & McGill College Observ. (m. dems.), 

 6 S. (2, 08). — Soil temp., 4 S. (7, 13). 



London, Roy. Soc. Proc: Records of differ. 

 of temp. betw. Mc. Gill College Observ. & the 

 Top of Mt. Royal, 4 S. (76, 1905). 



IV McMahon, James, A. B., A. 

 M. 1881 Dublin; war Assist. Prof., 

 Math., Univ., Ithaca; * 1856, t 1922 

 Juni. 



Amer. Math. Soc. Bull.: The use of n-fold 

 Riemann Spaces in applied mathem., 7 S. (15, 

 1909). 



Encyclop. Amer. : Vector analysis, 5 S. (27, 

 1920). 



IV MacMahon, Percy Alexander, 

 D. Sc. Dublin, Dr. e. h. Aberdeen; Ge- 

 neralsekretär, Brit. Ass. Adv. of Sc., 

 Univ., London; * 1854, Sept. 26, Malta. 

 Second memoir on the composits. of numbers, 

 70 S., London 1907. — Memoir on the theory of 

 the partits. of numbers, IV, 08, V, 6 S., London 

 11. — Combinatory analysis, Bd. 1, 300 4- 19 

 S., Cambridge 15. 



Amer. Journ. ot Moth.: The indices of 

 permntats. & the derivat. therefrom of functs. 

 of a Single variable associated with the permu- 

 tats. of any assemblage of objects, 42 S. (35, 

 1913). 



Cambridge, Phil. Soc. Proc: Diophantine 

 inequalityA x > [i. y, 21 S. — Seminvariants o 

 Systems of binary quantics, the order of euch 

 quantic being infinite, 15 S. (19, 1904). — 



