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""SCIENCE GOSSIP. .

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SCIENCE GOSSIP. MR. POCOCK gives (in Nature) a series of observa- tions on the action of familiar British spiders with regard to their prey and general habits. Noticing that the Agalena Labyrinthica, a country cousin of the commonest house spider, frequently left from its dinner the debris of bees as well as of flies, he placed a bumble bee in its web and watched the operation of capture. The Agalena first darted out, and after touching the struggling bee with its forelegs, started back as if to keep out of harm's way. Finally, after several abortive efforts to approach, it successfully broke its antagonist's guard and oommenced to wind a silken chain all round it. Having thus fastened it down, it cautiously pounced upon one leg and bit it, after which all anxiety as to the victim's escape seemed to leave it, for it retreated to a distance and sat down to wait. This and the curiously sudden death of the bee con- vinced Mr. Pocock after several observations that the spider injected poison into the wound it made, although certain authorities have declared that, the mandibular fluid of these spiders does not contain any poisonous properties. With harmless flies the be- nariour of the Agalena was much more deliberate and calm, though, strangely enough, it was afraid of a drone fly, mistaking it, as 99 out of 100 human beings would do, for a bee equipped with a sting. THE Economist, one of the most careful of statistical journals, publishes the following table, giving the growth of the professional classes in England, Scot- land. and Wales: 1891. 1881. Increase. National Government 79,241. 50,859.28,382 Local government. 64,851. 53,493. 11,358 Clerical profession 58,642. 51,120. 7,522 Legal profession 47,518. 43,641. 3,877 Medical profession 85,235. 64,548.20,687 Teachers 200,594 171,831 28,763 Artiste, including musi- cians, actors, &c. 79,115. 58,517.20,598 THE alarming idea has been broached that the -widespread prevalence of diphtheria in the metropolis may be due to the fcetid airlessness of modern flats. According to the Hospital, in many costly London flats not only is each human being provided with less air space than the 600ft. secured for the soldier in Barracks, but actually with less than the 300ft. which is the minimum in workhouse hospitals, or of the 250ft. below which even the casual wards are not permitted to sink. THE elaborate experiments of Professors Dewar and Fleming on the electrical conductivity and gpcific resistance of metals at extremely low tempera- tures have been continued since the publication of the initial paper last year, and further results have recently appeared in the Philos phical Magazine. The object of these further experiments was to determine the specific electrical resistance of metals and alloys over a wide range of temperature, from about 200 deg. C. to nearly 200 deg. C., the temperature of liquid oxygen. A large number of pure metals were subjected to test, including gold, silver, platinum, copper, aluminium, iron, tin, nickel, zinc, cadmium, lead, magnesium, palladium, and thallium. From the tables published it appears that the order of conductivity of these metals is very different at low temperature to what it is in the higher ranges. At the lowest temperature, reached by means of liquid oxygen and a vacuum as well, copper is the best conductor, instead of silver, and there Seems to be a real or fortuitous connection between the sonorous properties of the metals and their con- ductivity. Thus gold, silver, aluminium, and copper are all good conductors, while lead, zinc, tin, palla- dium, and thallium are inferior. The experiments tend to confirm the theory on which they were originally based, viz., that at absolutely zero tempera- ture the specific resistance of pure metals would become nil, and that most unattainable of rarities, a perfect conductor, would be actually realised. The -obeervations are to be continued into even lower tem- peratures in a further course of experiments. Tnz Royal Society's medals this year have been awarded as follows: The Copley medal to Sir George Stokes, F.R.S., for researches and discoveries in physical science a Royal medal to Professor Arthur Schuster, F.R.S., for spectroscopic researches and investigations into terrestrial magnetism aad disruptive discharge through gases; a second Royal medal to Professor H. Marshall Ward, for researches into the life history of fungi and wShizomycetes and the Davy medal to Messrs. J. H. Van't Hoff, and J. A. Le Bel, for work in connection with the theory of asymmetric carbon and its bearing on the constitution of optica!ly active carbon com- pounds. TaB extensive and increasing demand for india- rubber renders it possible that the supply will eventually become exhausted, so attempts at artificial cultivation of rubber trees are being made in various rubber-producing countries. LTNDim the title of Liquid Fuel" the Electrical Jteview recently discussed a remarkable paper fired off before the Technical Society of the Pacific Coast," by Admiral Selwjn, who claims to get out of a furnace heated by oil supplied through a steam-jet atomizer an evaporative efficiency of some 481b. per pound of oil burned, or six-fold the results now got with ooal. The combustion of nitrogen is supposed to play a decided part in this marvellous retult, and nothing is said as to the effects of nitric acid in large quantities on the boiler, the furnace, and the hapless attendants who would be likely to incur disintegra- tion during the process. A WRITER who regards sentiment as a beautiful thing in its way (but occasionally also in other people's way) protests somewhat vigorously in Nature against the interference of extreme advocates of bird protection, who have repeatedly obstructed and spoilt the very legislation they are clamouring for. In 1872 these enthusiasts were instrumental in post- poning for four years a bill with which they had in- considerately meddled; and when, early in the ..present session, "a bill to amend the Wild Birds' .Protection Act, 1880," was brought up by Sir Herbert Maxwell, and allowed, owing to his personal popularity, to go through unchallenged, it received, on account of the same agency, such modifications at the bands of the Lords' Standing Committee that on its return it was repudiated by its own author. The consideration of the Lords' amend- ments having been deferred for three months, this bill is now about to come up again for discussion, and it is hoped that some means will be found for bridg- ing over the friction between the two Houses which the ill-advised energy of sentimentalists has provoked. The writer referred to goes at some length into the question of destruction by bird-nesting and other practices, which it was proposed to put down. king the case of nightingales, goldfinches, and larks as typical one-, he shows fairly conclusively that the number of these birds which annually return to England to breed is far in excess of the actual number which the space will accommodate, that a large number have to perish through mutual rivalry (among the nightin- gales especially), and that even allowing for bird- meeting, twice as many birds must leave England each season as come to it. In the case of sundry sea-birds and others which build in open places where no law of trespass prevails, there is a serious risk from spoliation of the nests; but with these, being rarer and less known, the sentimentalists do not concern themselves. UWDBR the title of the American Electro-Thera- peutic Association there has been started across the Atlantic (the Pall Mall Gazette tells us) a body whose functions are directed towards the investiga- tion of all the attempts hitherto made to apply electricity to the cure of human disease, and the furtherance of whatever real work has been accom- plished in this respect. The association, which numbers among its members many of the most eminent physicians in America, is performing a very real service in eliminating quackery and establish- ing sound practice, and its deliberations are received both there and on the Continent with attention and respect. Mr. Newman Lawrence, whose writings have already aroused some interest in the subject amongst the unreoeptive medical men of our own country, is an energetic member of this American body, and has for some years past been endeavouring to found a representative institution of the kind in England. It is a generally admitted want-in theory; but it is still considered rather too new "—in practice. -h.. I

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GRAVE AND GAl. .

:, ; WILLS AND BEQUESTS.

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FRAGMENTS OF ENGLISH HISTORY.

MATRIMONIAL CONTRACTS.

AUTUMN-SOWN WHEAT.

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MARKET NEWS. -