The Arkansaw traveler., 1886-04-17
Compiled for The Arkdasa,c Trdreler SCIENTIFIC MISCELLANY

A French physiologist has ascey. tained that highly poisonous principle, known as cryptOmaines-may be de veloped in edible mushrooms undereey. tain conditions.
 Vaseline has been found by Dr. Du- bois to exert no harmful effects upop dogs, although its use for butter in food preparations was lately condemned Iva French hygienio commission.
 Very singular eyes have been found ;r q new orUstacoan B2rco:a5yasl2 2-,..,.....,. taken by the Norwegian North Atlantic dredging expedition. These organs have concave outer surfaces, they are attached close together, and they have no specific coloring matter.
 In Burmah, the latest addition ,o Great Britain's territories, are grown forty varieties of rice, varying ill hu.. from white to black. Many other kind, of edible grains are also produced ou,, 1 of them being known as Job tear. 6n account of the round shining ttal- like fruit it bears
 Endurance of Climatic Variations -A scientific Frenchman, Marquis de Na. daillac, estimate that European~ eau endure temperatures as widely apart d. :33j' at least. Thus, or Je!.u,ay -, 1 lSS2 two vessels in the Kara >ca we,e exposed to cold of Sj' below lIa. while i'll the country of the Tuuagee> in Central Africa, Duyeyrier has known the thermometer to rise as high as l52s
 An English physiologist Mir F. W [ Green, remarks that the function ot memory has not yet been decisively h. calized, but there are reasons for hoping that its particular place in the brain may some day be quite exactly known To cultivate the memory MT Green recommends Concentrate your al tention, classify and condense, make associations, substitute letters for tig ureS. and loealize your ideas
 From Scotch census returns Dr. ] B Russell finds that there is a very clos. relation between mortality and the number of inhabitants per inhabited room. For instance, the number ot persons per room was .S7 in Dundee. l.9l in Greenock, ,9S in Paisley and 2.05 in Glasgow; and the mean death rate rose steadily in the same order t. 25.I 2I.4, 27.S, and 2S6 per 1000 rc. >pectively, in these four towns
 The Dynamics of Bicycling English eXperimenters, Mcssrs G. J and G. Stoney, find that man can exert more power upon the bicycle than in other ways, such use of the human muscle, appearing to be the most economical possible. To drive a bicycle at a speed oi nine miles an hour required about 3,30o foot-pounds of energy per minute, while more than 10000 foot-pounds per minute were often applied to the ma chine, The power of horse according to wcll-known engineering formula, i. 33 GOO foot-pounds per minute.
 A Volcanic Region in the Atlantic Recent observations indicate the exist ence of a submarine volcanic crater be tween the Canary Islands and the coast of Portugal From cable-layins steamer, in latitude 39o D minute, north, longitude 9o 54 minutes west. the water was found to measure 1900 tathoms under the bow and 500 fathoms under the stern showing the ship to be over the edge of deep depression in the ocean bottom. An English geolo- gist, Mir. T. Mellard Reade, remarks that great irregularities are found in the bed of the sea otf Lisbon, due, probably, to < submarine chain of mountains
 Malarial Altitudes-While malaria has its ordinary habitat in low-lyine regions, it may under favorable condi- tons exist at great elevations. On the Tuscan Appenines it is found at a height of 100 feet above the sea; on the PyI'- cnces and Mexican Cordilleras, j,o0o feet; on the l!imalayas, 6,400 feet; on the island of Ceylon 6,j0o feet; and on the Andes, ,0o0 feet. At present the elevation of entire security has been thus approximated for various place~ In Italy, 40o to 900 feet: ill California l,ooo feet; along the Appalachian chain of the United States 800 feet: in tl.y. West Indies, ,400 to l 800 feet In any of these regions however, malaria may drift up ravines to an indefinite height
 Tides on the Atlantic Coast.-The great tidal wave which makes nearly two conplpta cirr1,itS of tho gIoba ;,,