42 A FEW CHEMICAL CHANGES 



order to maintain the value <>f its soluhilitv |>ro(luct, which 

 must be exceediniily small. Tlius tlie silver chloride accmnu- 

 lates verv slowly and finally becomes visible. This explanation 

 would seem to account for the appearance of silver chloride in a 

 mixture of silver nitrati? and chloroform a lon^;' time after 

 mixing'. 



The followinii' cxpcrinicnf was cari'icd out to find whether 

 chloroform could be ionized ])v radium to a sufficient extent, as 

 to produce a visible amount of silver chloride when mixed with a 

 solution of silver nitrate. About 50 cc. of chloroform which were 

 found to prodnc<» no precipitate on mixing with a solution of sil- 

 ver nitrate, were placed in a wide-mouthed reagent bottle, with 

 a capacity of about 125 cc. The l)rass tube containing the 

 radium was ])assed through a tightly fitting rubber cork and fixed 

 firmly into the mouth of the l)ottle. This solution was placed 

 in the dark, and at the end of twenty-four hours it was shaken 

 up with a few cc. of silver nitrate solution. After removing the 

 water from the clilorofoi-ni by allowing it to rcuuuu for a few 

 hours over anhydrous copier sulphate, the liquid renuuning 

 possessed a milkiness which must have been due to the presence 

 of silver chloride, thus proving that chlorine ions had been 

 separated fi'om the chloroform l)y the action <d" the radium. 



Arlioii of liddiiiin on A mi/i/dalni. 

 The laws of the action of light on glucosidcs, enzymes, 

 toxins and antitoxins have been thoroughly investigated by 

 Dreyer and llaussen,.^ who have shown that the effect of light 

 on the glucosidcs is to cause them to bi-cak (Knvu wirh the 

 fonnatiou of glucose. For tlie ])uri)os(' of investigating the 

 action of radium ui>oii the glucosid<'s, the most common one, 

 amygdalin C H NO was chosen. Tlie amount of decom- 



''^ 20 27 11 



position could readilv be. measured by estimating the amount 

 of glucose formed. 



I C.R,1907. Ho. p. .VJl. 



