Vaccination.-GasLights.-Sympicsomeier.-HygroTneter. 233 



VACCINATION. 



Between the years 1752 and 1762 the small-pox carried off in 

 Copenhagen 2644 persons; in the next ten years 21 16; — from 

 1772 to 1782 the victims to this disease were 2233 ; — and from 

 1782 to 1792, 2735. In 1802 vaccination was introduced and 

 enforced by authority; and from that time to 1818 only 158 per- 

 sons were carried off by small-pox ; viz. in 1802, 73 ; in 1803, 

 5 ; in 1804, 13; in 1805, 5 ; in 1806, 5 ; in 1807, 2 ; in 1808, 

 46; in 1809, 5; in 1810,4; — since which time not a single 

 case of small-pox has occurred in the dominions of the King of 

 Denmark. After such a fact, can it be longer doubted that the 

 small-pox, which has carried off infinitely more victims than all 

 the wars and pestilences which ever afflicted the human race, may 

 be entirely extirpated from the face of the earth ? This being 

 once effected, vaccination itself would become unnecessary. 



PORTABLE GAS LIGHTS. 



Mr, Gordon of Edinburgh has taken out a patent for this 

 contrivance, which consists in condensing from 20 to 30 atmo- 

 spheres of the gas in a vessel of sufficient strength, and furnished 

 with one or more apertures for combustion, with proper stop- 

 cocks. A globe of one foot diameter properly charged with gas, 

 •will yield a light equal to six common candles for twelve hours ; 

 and so in proportion for other sizes. The forms of course may 

 be varied. — The result of this contrivance will be, that families 

 will by and by send their servants to the gas-maker (as formerly 

 to the candle -maker) to get their portable magazine charged and 

 ready for lighting every day, or every second day, without sub- 

 jecting themselves to the trouble of making the gas in their own 

 houses. 



THE SYMPIESOMETER. 



This name is given by Mr. Adie of Edinburgh to a new in- 

 strument of his invention, for indicating those minute changes in 

 the weight of the atmosphere which might be supposed to arise 

 from the action of the sun and moon. Its indications are given 

 by the pressure of the atmosphere. He employs an elastic fluid 

 or gas (hydrogen is best), and any licjuid (excepting quicksilver) 

 not liable to be acted on by the gas which it confines, nor by the 

 air, to a contact with which it is in some measure exposed. The 

 li(|uid he prefers is almond oil coloured with anchusa root. The 

 whole is inclosed in a tube with double bulbs, and fitted to a 

 common thermometer. 



Ni;w HYGROMETER. 



This instrument, the invention of Mr. Adie, is composed of a 

 small bag made of the internal membrane of the annido p/trag- 



miles, 



