WHEAT, 93 



The latest writers on blight, such as Davy, Banks, 

 Loudon, and Grisenthvvaiie, divide this disease into 

 four varieties : blight from cold and frosty winds ; 

 blight from a sultry and noxious vapour; blight from 

 a want of nourishment ; and blight from the exten- 

 sive propagation of a minute fungus. 



Blight from cold winds is usually confined to those 

 from the east and northeast, and is felt chiefly in the 



in vitriol and water and limed, produced 635 sound ears and 40 

 smutted ; proportion, 16 sound to one smutted. 



Ex. No. 8. — 400 grains impregnated with smut, and steeped 

 in copperas and water and limed, gave 205 sound ears and 445 

 smutted ; proportion, one sound to two smutted. 



Kx. No. 9—600 sound grains from a badly-smutted crop, 

 pickled and sown without any preparation, produced 612 sound 

 ears and 53 smut ones; proportion, 11 J sound to one smut. 



Ex. No. 10. — 600 sound grains impregnated with chamber-ley 

 and limed, produced 757 sound ears and 16 smutted ; propor- 

 tion, 47 sound to one smutted. 



Ex No 11. — 200 gr.nins impregnated with smut, and sown 

 without any preparation, produced 67 sound ears and 375 smut- 

 ted ; proportion, one sound to five smutted. 



Ex. No. 12. — 200 grains impregnated with smut, and pre- 

 pared with chaml)erley and limed, produced 374 sound ears 

 and 43 smutted : proportion, nine sound to one smutted 



Ex. No 13. — 200 grains impregnated with smut, and steeped 

 in arsenic and water and limed, produced 443 sound ears and 

 44 smutted ; proportion, 11 sound to one smutted. 



Ex. No. 14 —200 grains impregnated with smut, and rubbed 

 with dry arsenic, produced 317 sound ears and 43 smutted; pro- 

 portion, eight sound to one smutted. 



Ex. No. 15. — 200 grains impregnated with smut, and steeped 

 in vitriol and water and limed, produced 430 sound ears and 40 

 smutted ; proportion, 11 sound to one smutted. 



Ex. No. 16. — 200 grains impregnated with smut, and steeped 

 in copperas and water and limed, produced 260 sound ears and 

 190 smutted ; in the proportion of li sound ears to one smutted. 



These experiments, and they were made by Mr. Donaldson 

 with great care, agree in the main with those instituted by Sin- 

 clair and Marshall, and tho.'ie made by Arthur Young. The 

 very great difference in sowing grain pure and free fiorn the 

 cuntiigion of smut, and that infected, both without preparation, 

 as shown in the first two experiments, is decisive on the point 

 of infection, and should induce every farmer to use his utmost 

 endeavours.to sow none but pure seed. — Eds.] 



