a sound healthy crop. A few yards of land in the gateway, that 

 had not been properly cropped and cultivated still produced a badly 

 diseased crop. It is, however, to be noted that previous to 1902, 

 experiments had been conducted on a portion of this field with 

 various substances, more especially lime, and it is conceivable that 

 the action of these substances is traceable in the results obtained 

 in 1906. 



It was noticed that about 20 per cent of the charlock in the 

 swede crop was affected by finger and toe, while the" swedes were 

 comparatively free. The charlock appeared, therefore, to be more 

 susceptible, and it is clearly of importance to keep such land free 

 from it, in order to prevent it from perpetuating the disease." 



SIBYL LONGMAN. The Dry-rot of Potatoes. (Toum. Linn. Soc. 

 London, Bot. 30, 1909, N 270, pp. 120-129, pi- i)j E. S. R., 

 Febr. 1910. 



Investigations have been carried on to determine whether the 

 fungus of dry rot of potatoes (Fusarium Solani) is capable of in- 

 ducing disease in the growing potato plant, and whether the dry 

 rot can be induced in potato tubers directly by inoculation with 

 spores, as it is commonly supposed dry rot usually follows wet rot. 



As a result of the study, the author has reached the conclusion 

 that F. Solani is not only a true parasite of the resting tuber but 

 also is capable of attacking the growing potato plant. In regard 

 to the second question, there appears to be no time relation 

 between an outbreak of dry rot and one of wet rot, and it is 

 shown that dry rot may be induced by inoculating healthy potato 

 tubers with cultures of the dry-rot fungus. 



Experiments were made to determine the possibility of disin- 

 fecting the potato tubers by heating, but it was found that this was 

 impracticable, as the death temperature of the fungus is higher 

 than that of the potato. 



Internal Brown rot or Sprain of Potatoes. (Journ. Bd. Agr., 

 16, 1909, N. 8, pp. 647-648); JS. S. X., March. 1910, Vol. XXII,' 

 N. 4, Washington. 



A description is given of the internal brown rot or sprain of 

 potatoes, the precise nature of which is obscure. In some spe- 

 cimens mycelium was found in the tissue of the brown spots, and 



