68 THE VEGETABLE PROTEINS 



PERCENTAGE OF TOTAL SULPHUR IN DIFFERENT PREPARATIONS OF EXCELSIN. 



I. II. III. IV. V. 



ro6 1-12 1-07 1-083 nog 



PERCENTAGE OF SULPHIDE SULPHUR IN EXCELSIN. 



One gramme boiled with 30 p.c. NaOH, Heated with 30 p.c. NaOH. 



Zn and Pb(C 2 H 3 O 2 ) 2 One gramme One gramme 



7^ hours. at 135 at 165 



2, hours 4^ hours. 



IV. V. IV. V. V. 



0-339 0-347 * 2 94 0-293 0-350 



0-321 0-344 



0-289 0-297 



0-277 0-290 



0-257 0-284 



0-281 



PERCENTAGE OF TOTAL SULPHUR IN DIFFERENT PREPARATIONS OF GLIADIN. 

 I. II. III. IV. 



1-002 1-022 I-030 1-058 



I-O05 I-O27 



PERCENTAGE OF SULPHIDE SULPHUR IN GLIADIN. 



One gramme boiled with 30 p.c. One gramme with 30 p.c. Five grammes with 30 p.c. 



NaOH, Zn and Pb(C 2 H 3 O 2 ) 2 NaOH and Pb(C 2 H 3 O 2 ) 2 NaOH and Pb(C 2 H 3 O 2 ) 2 



7^ hours. at 135 4 hours. at 165 5 hours. 



0-627 0-635 0-624 



o-6n 

 0-600 



PERCENTAGE OF TOTAL SULPHUR IN DIFFERENT PREPARATIONS OF OVALBUMIN. 



I. II. III. IV. V. VI. VII. VIII. IX. X. 



1-610 1-612 1*572 1*644 1*613 1*619 1*613 1*634 I '59 1*651 



These figures agree well with those given by several other investi- 

 gators, namely : 



Hammarsten (594) 1-64 



Bondzynski and Zoja (589) 1-66 



Krtiger (597) 1-66 



Hopkins (595) 1-57 



PERCENTAGE OF SULPHIDE SULPHUR IN OVALBUMIN. 



One gramme boiled with 30 p.c. i gramme with 30 p.c. NaOH 5 grammes with 30 p.c. NaOH 



NaOH, Zn and Pb(C 2 H 3 O 2 ) 2 and Pb(C 2 H 3 O 2 ) 2 at 135 and Pb(C 2 H 3 O 2 ) 2 at 165 



7^ hours. 2 hours. 4^ hours. 



0-523 0-523 0-491 



0-511 0-518 



0-504 0-505 



0-471 0-459 



0-455 0-441 

 0-425 



The result obtained with 5 grammes heated at 165 agrees very 

 closely with the average of the others and is also in accord with the 

 results obtained by Kriiger (597), Malerba (599) and Schulz (605), who 

 found respectively 0*44, 0*49 and 0*49 per cent, of sulphide sulphur in 

 ovalbumin. 



If the sulphide sulphur obtained by Schulz' method originates from 

 a cystine complex in the protein molecule, and if this complex yields 



