or toxicological symptoms and all the birds remained healthy throughout the study. Feed consumption was significantly reduced at the 300 g/ton level and the birds in this group ended th$ medication period gaining 60% as much weight as the control group. There were no discernible differences in the quality of the eggs or the egg shell.

m/e 266 (M+), 338 (monosilylated product)4, 410 (disilylated product)4, 248 [monosilylated - (CHslgSiOH]4.

Auf 3 verschiedenen Wegen werden 180 N‐Phenylalkansulfonamide wie z.B. die Verbindungen (I) und die N‐heterocyclischen Sulfonamide (II) dargestellt und auf ihre herbicide Wirkun e rüft.

No abstract