BLIGHT IN CORN. 151 



- No. 10; Ditto witli an infed very adive in the ear, yellow, 

 fee drawing A B. Fig. 1. Plate IX. 



No. 11. Two perfectly healthy ears from the fame root, 

 both healthy throughout, yet on the leaf a fpeck or two of 

 Sir Jofeph's fungus was originated, and well grown: it was 

 of the orange colour. o «• - 



No. 12. An ear fad ripening, folid in the grain, yet had 

 loft its firft fix lower grains, Iaft joint green, beards yellow, a 

 few fpots on the (heath of the grain, feemingly occafioned 

 fc>y a fmall black fly found in it. 



Obfervations made on the fame Day on Grains, 





Difeafed grains were always found to be full and plump with- Difeafed grains 

 out any aperture ; the fine ikin that holds the flour very green, c cn e * 

 yet all black within ; the external furface of the black matter 

 covered with a white concretion, perhaps the faccharine 

 matter of the wheat. Sound grains found in difeafed ears, 

 all the difeafed ears fmelt fifby. 



Obfervations made on the Straw. 



The difeafe always attacks the portion of the ftraw that Difeafed ftraw. 

 peeps beyond the (heath leaf near the joint, and evidently 

 commences at the pores, as old ftraws will (hew; but the 

 fungus cannot, I think, be the caufe of the difeafe; becaufe < ^ 



where no fungi have taken root, the corn is compleatly cor* 

 rupted. Thefe fungi grow it is true, fafteft on difeafed ears, 

 probably becaufe when the ear is difeafed it draws lefs humi- 

 dity from the draw, fo that the difeafed ears feem to affiit the 

 growth of the fungi, not the fungi the difeafe. In facl, I 

 believe they live on the fuperfluous moifture of the ftraw, or 

 returning fap. 



On the 27th July Iaft, J 805. I examined at leaft twenty Blighted ears, 

 blighted ears of corn, and could only find one among them * he ftraw not 

 that had the fmalleft degree of rujl, and that only a fpeck r 

 or two on the lower leaf that (heaths the third joint. The • 

 fpots were orange colour and deep purple, and did not occupy 

 Half the diameter of a fpace of three inches long. 



Upon again examining many healthy plants, I found not Healthy plants 

 pnly their (heath leayes, but even the ftraw eaten away by -^"l the ftr ** 



fome 



