In making chemical balances for fine work the beam is made in the truss form to prevent the bending which takes place even under such small loads as an ounce or two. Prof. Mendeleef has a balance that will turn with one-thousandth of a grain, when each pan is loaded with 15,000 grains. This extreme sensibility is obtained by the use of micrometer scales and cross threads at the end of the beam, these being observed by means of a telescope. Of course one weighing with this complicated apparatus occupies a long time. In most balances the beam rests on steel knife edges; but a maker who has lately obtained celebrity makes his supports of pure rock crystal. The steel edges can be seen with the naked eye; the quartz edges cannot be seen even with a magnifying glass. One writer on this subject thinks that with these perfect crystal edges, with an inflexible girder beam, a short beam giving quick vibrations, and a sensitiveness that can be increased by screwing up the centre of gravity, there can hardly be a practical limit to the smallness of the weight that will turn the beam. The amount of motion may be very small, but if this can be observed, the limit of possible accuracy is very much extended. GOVERNMENT CONTROL OF THE DEAD. What the population of European countries was a hundred years ago it would be hard to tell with accuracy; but the nations have doubled and trebled in strength within the century. Sanitary precautions have increased in importance, and the very noticeable movement in regard to social hygiene which now possesses English society is perhaps due in part to the obvious dangers to which thirty million human beings are subjected when living together on such a small area. The medical officer for Birkenhead has pointed out that it may be necessary for the government authorities to take more complete charge of the dead as a possible source of infection. He says that the intelligence of deaths from infectious diseases now furnished by local registrary would be much more useful than it is as a means for limiting the spread of disease if the medical officer were vested with further powers in respect to the infected dead body. At present neither the medical officer nor any one else has any power to order the immediate removal of an infected body, and those in charge of it might do what they liked with it. He advocated the necessity of power being given to medical officers to order the immediate removal of the infected bodies to a public mortuary and their speedy burial. MICROSCOPIC LIFE.