| Show RECENT discoveries IN SCIENCE CF the production of liquid air on a commercial scale has brought out sowe interesting applications one of these being the use of the material as an an explosive in the slow blow evaporation of the liquid in open air the nitrogen escapes first so that a high proportion of oxygen may be readily ob and when this reaches 40 or 60 per cent the liquid forms with char coa an explosive comparable to dynamite in power bad and like dynamite capable i of at being exploded by a dr de to vator the mixture has been tested tasted in a coal mine near munich with fair re results the explosive is not expensive but as am it must be used within a lew few atter after being produced it is not to come into use expect in baang bloating on a large scale as in cutting an alpine tunnel the discovery suggest geste the idea that plants for making explosives as needed might he be better for warships then than great powder magazines the ahe products byproducts by of blast furnaces i in scotland are now being generally utilized their thedr recovery having proven a profitable Crofit able industry figures given by mr A H sexton show that from fow AW furnaces consuming 2000 tons tona of coal per week wath a production of 1490 tow toso ot oc pig iron there are re weekly tons of pitch gallons of oil and 20 tons of sulphate sui phate of Wm ammonia the aggregate value is the expense in wages and acid used lured is placed at 50 and in interest lacerr st an plant at 38 leaving a balance for depreciation de t prof antler affirms be reduced c u one half by medle medicines jues bit rm nally wyt creosote being an aa effective preventive much decay may be avoided by cleanliness of mouth and teeth and the use of magnesia especially at night when acidity prevails the disagreeable odor often acquired by water waiter in open reservoirs has been lately shown to be due in many cases to vegetable growths and not always as has been supposed to decomposing organic matter various minute plants planta are now known to impart both unpleasant odor and aad taste to such water fires play a considerable part in forest development the great forest fires of canada according to dr bell are mostly set by lightning and occurred even in the pleistocene epoch of geology recently burned portions of the great forest between alaska and the straits of belle isle are marked by a green woods of resinous pine are consumed fastest fallen branches and dead leaves burning lige tinder and the flames wise rise nearly feet while rushing along at racehorse race horse speed one fire spread miles in ten hours birds and beasts are destroyed the amphibious phi bious creatures like beavers and muskrats alone having a chance of escape the traces of a fire remain nearly a century after 16 15 or 20 years the ground is covered with poplars willows etc which shelter young firs and other trees but in 60 50 years the conifers are out beneath the pines some pines would hardly be produced without the fire which sets free the seeds alanskas forest may be divided into thirds of which one third is 60 50 years old the second between 60 50 and and the third over A paving brick said to be equal to granite while having the advantage of regular shape is now being made in El thuringia Thu from copper slag As sudden cooling odthe of the material forms the slag is run in from the smelting smelling sm elting furnace and annealing is affected by thickly covering the filled moulds with sand and allowing them to stand 72 hours or more the moulds are of iron each having a caps capacity elty of 36 bricks was mathus right he held that population tends to increase more rapidly than its wants can be supplied if not checked by war famine or other dire calamity and it is suggested that the present universal unrest and war craving may be an instinctive consequence of unchecked multiplication of the race during long peace antl anti mal th however appears the more evident theory that overproduction over production of lifes necessities has turned human activities tivi ties into any new fields that open noninflammable non inflammable artificial silk to Is produced by a german chemist by using instead of the usual nitta nitrated ted cellulose a solution of purified cellulose in acid there are virtues in bloodletting blood letting of which the unscientific practitioner of old knew nothing if we may accept the conclusions of a russian physiologist named essipov Essi por this experimenter believes he has proven that profuse bleeding changes the composition and properties of the blood remaining giving it a bactericidal action loss of blood equal to about a fortieth of the body weight gave rabbits pigeons and guinea pigs a marked resistance to infection by bacteria and especial protection against the microbe of cholera the et ef feet seemed to be produced gradually i reaching a maximum in about twenty four hours how to preserve yeast tor for a considerable sid erable time has been a difficult but important problem it Is itself destroyed by antiseptics but the extraordinary tenacity of life among certain micro organism when dried has suggested to a german chemist the plan of cf dessie cation and he has now demonstrated that the yeast can be kept in this way without lose loro of vitality for at least a year the yeast cake la Is first made into pellets the size of a pea these pellets are partially dried in air then sifted over with pulverized potato starch and thoroughly dried in a rotating cylinder heated moderately but not enough to injure the yeast and axe are finally placed in airtight air tight jars snow statues are the achievement of a french sculptor pierre roche through scientific means within the statue which to is of copper is placed a vessel containing carbonic carbonI 8 acid whose slow evaporation generates great cold and condenses the moisture of the air in a snow like coating on outer surface of the figure this covering remains as long as aa the refrigeration is continued cultures of the typhoid bacillus hav hare been found by dr edward germano to retain their vitality for sixty days in 1 warm moist air although killed within twenty four hours in dry air he concludes that transmission of the disease by winds from infected districts to 4 highly improbable but that it may be conveyed long distances in blanket blanke tv and woolen clothing that have been imperfectly i dried and dis infected the st bernard oak at franco franc was planted in 1070 its trunk la is hollow and twenty two feet in circumference |
