J. V. Eyre, E. 8. Salmon and L. K. Wormald 297 



VowiKirison of Atnmotnuin poli/sulphide Sohitions VII diid XI 

 (both solutions with 1 % soap). 



The solutions proved similar in action at the only strength at which 

 they were compared. Solution VII was used with 0-077 % polysulphide 

 sulphur and Solution XI with 0-078 %. Ten leaves were sprayed. With 

 Solution VII all the patches were killed on two leaves; many patches 

 were killed on the remaining eight leaves, but some patches on each* 

 leaf regrew scattered or clustered conidiophores from their edges. With 

 Solution XI many patches were killed on all the ten leaves, but it was 

 not fungicidal for any leaf. The effect of the two solutions on the leaves 

 at the same nodes are tabulated below: 



Sol. VII Sol. XI 



No. of leaf No. of leaf 



Fungicidal I. - — 



Very nearly fungicidal ... 5, B, 8, 9, 10 I, 5, 6, 8, 10 



Not quite fungicidal ... 3, 4, 7 2, 3, 4, 7, 9 



Vomparison of AiiiiiKmiiini polyimlphide Solutions VIII and XI 

 (both solutions with 1 % saponin). 



There was similarity in the action of these two solutions. In Experi- 

 ments 28, 29, Solution VIII contained 0-077 % polysulphide sulphur 

 and Solution XI 0-078 %. If we classify the results under the three 

 headings "fungicidal." "not quite fungicidal," and "non-fungicidal," 



we have the table; 



Sol. XI Sol. VIII 



No. of leaf No. of leaf 



Fungicidal 2, 4, 5 2, 4, 7 



Not quite fungicidal ... 3, 7, 8 1, 3, 5, 8 



Non-fungicidal ... ... 1, 6 



In Experiments 35, 36^, where both solutions contained 0-157 % 

 polysulphide sulphur, if we tabulate under four headings, we have 



Sol. XI Sol. VIII 



No. of leaf No. of leaf 



Fungicidal 1,7,9,10,12 4,7,9,10,12.13 



Very nearly fungicidal ... 3, 4, 5, 13 3 



Not quite fungicidal ... 2, 6, S 1, 2, 5, 



Non-fungicidal ...... 11 8, 11 



The absence of complete fungicidal action with 0-157 % polysulphide 

 sulphur is probably to be attributed to the inferior wetting powers of 

 saponin as compared with soap. 



1 Sufficient force was used in this experiment practically to drench the leaves. 



