tion a crystalline mass, which was dissolved in cold water and trea- 

 ted with precipitated carbonate of calcium. As soon as the évo- 

 lution of carbon-dioxide ceased the undissolved carbonate was filte- 

 red iitf and tlie filtrate heated for a few minutes to the boiling 

 point. There was in tliis way produced a white precipitate, which prov- 

 ed to be the basic calcium sait of haematic acid. The precipitate 

 I stirred into water, decomposed with some hydrochloric acid and 

 extracted the liquid with ether; after evaporating tlie latter white 

 crystalls were obtained, which after two i-ecrystallisations from as little 

 as possible water showed the melting point of 9n.5 — 96**, that is 

 nearly the same as g'iveu by Küster for his anhydride of haema- 

 tic acid. In ail 0.8 gr. of the substance has been obtained: 



Analysis: 0.1 228 gr. subst. gave 0.2339 gr. CO., and 0.0522 gr. H^O 

 obtained 51.95»/o 47"2«/o H 

 calcul. CgHgOs 52.17 „ 4.34 „ „ 



In order to get further proofs of identity of this substance 

 with Küsters acid, 0.5 gr. were dissolved in water, neutralised with 

 ammonia and precipitated with silver nitrate. The amorphous white 

 precipitate gave the following results on being analysed: 



0.6282 gr. gave 0.4380 gr. Ag.^S 

 cale, for C8H7Ag3b6 + Vs^^O — 60.83o;„ Ag 

 found 60.64 „ „ 



The properties of the oxidation jiroduct of phylloporphyrin de- 

 scribed viz. its melting point, its composition, the readiness to give 

 a basic calcium sait and the composition of the silver sait make it 

 evident, that the oxidation of phvllopor})hyrin by means of bichro- 

 mate of sodium leads to a suljstance identical with the anhydride 

 of the threebasic haematic acid, obtained under similar conditions 

 from haeniin, haeniatoporphyrin and bilirubin. 



IL 



Tlie réduction »f pliyHocyaiiiii by zinc dust. 



E. Öchunck aud myself ') hâve as far back as the year 1895 

 studied the change, which derivatives of Chlorophyll undergo, when 

 heated witli zinc dust. We noticed that there were formed peculiar- 



') l'roi'. Kuy. isoc, London 59, 233. 



