2o6 Transactions British Mycological Society. 



With fungus / (i) three stunted seedHngs with brown roots, 

 (2) and (3) healthy. 



With fungus 5 (i) two healthy, one killed, (2) two healthy, 

 one diseased and (3) one healthy, one killed and one with root 

 system and tips of leaves attacked. 



With fungus A (i) one healthy, one killed, one attacked at 

 hypocotyl, (2) two healthy, one diseased, (3) two healthy, one 

 slightly diseased. 



With fungus B (i) one healthy, two diseased, (2) and (3) healthy. 



(In the controls for 5 and A, a seed in one of the pots failed.) 



Experiment III. A small rectangular field plot was divided 

 longitudinally into two by a path one foot wide. On one side 

 of this path were planted five rows of ten sets each of potato, 

 variety "Sharp's Express." The distance between the rows was 

 two feet and the interval between sets one foot. End on to 

 these were planted in a similar manner five rows of ten sets each 

 of the variety "British Queen." End on to the " British Queen " 

 were planted five rows of ten sets each of the variety "King 

 Edward." Next to the "King Edward" were planted five rows 

 of broad beans, followed by five rows of garden peas. Each block 

 of five rows was separated from its neighbour by a path two feet 

 wide. The distance between the rows of beans and peas was 

 one foot and each row comprised twenty-two holes at an interval 

 of six inches, and sown with one seed per hole. All were sown in 

 the usual manner without manure or any special treatment and 

 served as controls. On the other side of the longitudinal path 

 were sown similar blocks of five rows of "Sharp's Express," 

 "British Queen," "King Edward," broad beans and garden peas. 

 In the case of these potato sets a cylindrical piece of the flesh 

 had been extracted by means of a cork borer and in the cavity 

 so made a fragment of one of the fungi E, I, A, S and B, growing 

 on malt extract agar was placed in each of the ten sets in a row. 

 Thus in the five rows of each variety one row was infected with 

 E, one with /, and so on for S, A and B. These rows of beans 

 and peas were also infected with one of the five fungi by placing 

 a small piece of the culture in contact with the seed in the soil. 

 Sowing was done on April 7th. All the potato sets in controls 

 and infected germinated with the exception of one set in each 

 of two infected rows of "British Queen." The latter were ex- 

 amined and found to be very hard but not invaded by fungus 

 hyphae. The failure of infections was probably due to the fact 

 that the conditions of temperature and moisture were not 

 suitable to the fungi. The results of germination of beans and 

 peas are given in the table on p. 207. 



Experiment IV. Previous experience in regard to the powers 

 of E to infect pea and bean seedlings and the records for the 



