The Sentinel=record., 1915-05-05

SerVatlOn are WOrkS or great arChiteC- tural beauty.
 The most important improvement to Hot Springs made by the govern ment is the system of driveways and walks made on the three mountains comprising the reservation They wind around the sides of the mountain by easy grades to the summits of five or six hundred feet above the city, disclosing at every point some new scene of beauty among the surround ing peaks and valleys of the Ozark mountains. There are about fifteen miles of drives and six miles of walks.
 The governments interests are looked after by superintendent who is appointed by the President
 Official Report of pr. Botwood.
 The Hot Springs Reservation com prising about gil acres, belongs to the United States, and is under the control of the Secretary of the Inter for. There are about lS springs is suing from the base of AHot Springs Mountain, of varying degrees of tenn perature and having a combined flow of about S50000 gallons daily. There are tWenty-three bath houses receiv-
 ing water under lease from the United States besides the government free bath house for indigent persons and is managed by a superintendent, who maintains order and sees that the bath houses are conducted in a proper manner. Many thousands of persons visit Hot Springs every year for the purpose of taking the baths, and the government is spending large sums of money in improving and beautifying the Reservation.
 In the introduction of his report, Dr. Boltwood gives lucid and interesting account of the present state of our knowledge concerning the radio-activ. ity of water, and brief resume of tho history of discoveries relating to this phenomenon. He states that the prcnomenon of radio-activity eX- hibitod by certain substances consists in the spontaneous emission of ra- diant energy, and was first observed by Bacquerel in the case of the salts of the elements uranium The phc- nomenon was later noted by Schmidt in the case of the salts of the element Thorium Then followed the strik- ing investigation of NJ and Mme. Curie. which led 10 the discovery of two new clements, polonium and radium, which possesses the property of radio-activity to marked degree A third element discovered by Dcbierne is also strongly radioactive. The existence of another radioactive element is claimed by Holman, but very little is known at present of the properties of this substance. A very considerable number of ordinary sub stances (rocks and metalsl have also been found to be very slightly radio CT this is due to the properties of the simple substances, or tO the pre- scnce of minute traces of the strongly radioactive clements The rays sent out by radioactive substances arc known as "Becqueral rays, and have been shown to be complex in char acter In the case of radations ui radium salts, the rays have been found Ido consist of three different types. differing in the readiness with which they are absorbed by the matter, and the extent to which they are de- flected in magnetic field.
 When solutions of radium salts are allowed to stand in a closed vessel it is found that an extreDely minute quantity of a highly radioactive gas gradually accumulates This gas is known as the "radium emanatiou. '" its radioactive power falling to about one-halt after four days The walls of vessel which contained this ra- dium emenation also became radio active, by what is called induced or excited activity, and the theory is that by radioactive &sintcgration of radium emanation a Solid has been deposited on the surface of the walls which itself is radioactive. Tn, solid is called "cmauation N and it rate of decay is very rapid. The cm anation contained in any solid salt of dissolying the salt in water and boil ing the solution If the solution k evaporatcG to dryness, the solid salt radium can be entirely removed and will again he formed This freshly prepared salt is found to be only about 25 per cent. as radioactive as the same salt before the removal of the gas emaaation It's radio-activity
 however, will gradually increase on standing until at the end of about one month it's activity will have reached a maximum beyond which no further change will take place. This increase in the radio-actiyity of the salt is due to the production of fresh quantities of cmanation within it. The action of the Bacqucrel rays may be divided