KEY AND INDEX 



Manufacturing, methods at be- 

 ginning nineteenth century 

 compared with those at end., 



6, 21-22. 



Marchettis, Peter, Italian sur- 

 geon, 2, 185. 



Marconi, Guglielmo, first to 

 succeed in transmitting wire- 

 less messages across the ocean, 

 8, 54 ; methods and results of 

 his system, 8, 56; his early 

 experiments, 8, 58; first 

 trans- Atlantic message, 8, 61. 



Marconnet, Captain, and Lieu- 

 tenant Fegaunt made a cross- 

 country flight on a Farman 

 bi-plane, June, 1910, 7, 298. 



Marey, Stephen, his interest in 

 the development of chrono- 

 photography, 8, 250. 



Mariette, Auguste Edward, a 

 worker in the field of Egyp- 

 tian archseology, 1, 28. 



Marine Biological Laboratory 

 at Naples, The, Chapter V, 

 6, 113. 



Marine Biological Laboratory at 

 Naples, the aquarium in, 6, 

 113119; arrangement of 

 tanks and exhibits in, 6, 

 114; eels and cuttle-fish in, 

 6, 116; the octopus in, 



5, 117; the technical de- 

 partment of, 5, 120; Dr. 

 Anton Dohrn, founder of, 5, 

 12 1 ; his associates, 6, 122; 

 collecting specimens for, 6, 

 123, 124; methods of pre- 

 serving jellyfish in, 6, 127; 

 many nationalities represent- 

 ed among the workers in, 



6, 130; Dr. Driesch's studies 

 of heredity at, 6, 131; the 

 study of chromosomes at, 6, 

 133 ; experiments in the divis- 

 ion of egg-cells at, 5, 134; 

 publications of, 6, 139; 

 marine laboratories of other 

 countries, 6, 143. 



Mariner's Compass, 7, 7; con- 

 sists of a magnetized needle, 



7, 7; its use antedates the 

 Christian Era, 7, 7; develop- 

 ment of 7, 8; Stephen Bur- 



rows credited with the dis- 

 covery that the needle shifts 

 its direction, 7, 9; Dr. Halley 

 showed that the deviations of 

 the compass were due to 

 some influence having to do 

 with the problem of terres- 

 trial magnetism, 7, 10; 

 Graham discovered daily 

 variations of the compass, 

 7, 10 ; Wales observed fluc- 

 tuation of the compass due to 

 the ship on which it is placed, 

 7, 1 1 ; Matthew Flinders 

 discovered that the influence 

 of the ship over its compass 

 varies with the direction of 

 the ship's prow, 7, n; Bar- 

 low suggested that compen- 

 sation for deviation of the 

 compass be effected by the 

 adjustment of bodies of iron, 

 7, 1 1 ; Professor Airy's use of 

 permanent magnets to effect 

 compensation, 7, n; dip- 

 ping of the magnetized needle 

 first observed by Robert Nor- 

 man, 7, 13; attempt to over- 

 come the dip by applying a 

 balancing apparatus, 7, 14; 

 modern compass invented by 

 Lord Kelvin, 7, 14. 



Marine Galvanometer, invented 

 by Lord Kelvin, 8, 38. 



Mariotte, Edme, studies of at- 

 mospheric pressure, 2, 210; 

 developed law of gaseous 

 pressure independently of 

 Boyle, 6, 66. 



Marsh, Professor, his discovery 

 of the remains of many verte- 

 brates in the Rocky Mountain 

 region, 3, 106; his description 

 of the fossil horses, 3, 108. 



Marsh, quoted to the effect that 

 rust helps preserve iron em- 

 bedded in concrete, 9, 198. 



Martainville, suggested a change 

 in the shape of the envelope 

 of the balloon, 7, 248. 



Martin de Bohemia, and Roder- 

 ick and Joseph, credited 

 with inventing the apparatus 

 known as the astrolabe, 7,19. 



[I 9 6] 



