304 Scientific Intelligence. 



quantity of heat which penetrales normally into a body and that 

 which goes out of it in the same direction is here called the ab- 

 sorbent power. 



4th. That it is possible to find a nni I • u i< il r< iti i 1 > * \ « 

 the absorbent power of a body and its coefficient of eonductibility. 

 ( 'ompf, s ]lt :il ,ius. lxxxiv, 259. e. c. P. 



10. Licrea** <>r W, i.jht h,j < ;.u,h„*t;.„,.— M. A". Mi:\ i i: >«i--; y> 

 a form of lectun - mm • > \» riim tit 1 - -I. <\\ tin i i e-< «>t v< un' 

 in the combustion of a substance at the expense of the oxygen of 

 the air. Some years ago Professor Hoffmann showed a 

 method of demonstrating experimentally the increase of weight <>t 

 iron when burned in oxvgen, but there has been a- yet im siiiinlo 

 means of proving this fact for objects like a candle, which appear 

 to the eye to diminish. A candle is attached to each pan of a 

 balance, and above one a glass tube open at both ends i- buagi 

 at nearly the height of the wick. In this tube is a piece of wire 

 gauze holding some pieces of caustic soda; after bs 

 candles, one of the candles is lit, when the products of combiiv 

 tion are retained by the soda and this end of the beam d< soenfflfc 

 At the end of a quarter of an hour the difference in w& 

 amount to three grams.— Ber. Chem. Genell.Ax, L8G6; Bib. I »"'-• 



11. Absorption of IJ.jht.— M. Lippioh of the Vienna Academy 

 ' has recently been roves I b< a • an drataw e 



of absorbent particles upon absorption. As such an 

 must be eg] I en the substances i 



defined absorption bands, and, with considerable densil 

 no strong colors, he chose for his experiments the nitrate « 

 didymium oxide, which has these properties in a high degree. A 

 • pretty concentrated aqueous solution of this suit, in a ves-ei "" 

 centimeter thick was spectroscopically compared with a solution 

 having a concentration of only 0*1, 0'05 of the first. T 

 tions were in tubes of ten and twenty centimeters severally- v 



M metroscope was used, and the light sources were two gas 

 lamps so regulated that both spectra showed rite tan 

 on til,- parts that were free from absorption. Even with the con- 



i ratio 1-10, there were marked differences i 

 tion bands. The very characteristic bands in the yellow and y. ' 

 low-green were, for the more concentrated solution, i 



I toward the red end of the sped 

 limit toward the violet was the same for both solutions. A» e 

 much narrower band- ii th« ixreen -le.u . I , 



I'* ' ! ■ er part- did', r.-nccs vvci%- ,,b-ei'\ I Ii ditfb dt} " l " 



>i'l - tl - irl , i r ! . br. idth ot tin ib-urption .and- t 



2o8. ° 1 K . c. r. 



12. Lipp.u, #„„■.< EL. -feu,., t, >\— Professor Dewak exhil'hy-d ^ 



-im|.!e t leetrornetcr w hich i < ; 

 is not really independent of the temperature or condition of the 



