The introduction of the Dalton Plan to an English school resulted in considerable interest .
When , following Parkhurst 's visit to England in 1921 , the school opened its doors to visitors , over a thousand people attended over three days .
The introduction of the Dalton Plan to an English school resulted in considerable interest , and when , following Parkhurst 's visit to England in 1921 , the school opened its doors to visitors , over a thousand people attended over three days .