Elsie J. Oxenham 
Jen of the Abbey School [EPUB ebook] 

“I don’t like the look of that sky!” said Miss Deane, with a worried glance at the clouds creeping up. “We’re a long way from home. I wonder if we could find shelter in the village over there?”
The tennis lawn and the cricket field at Rocklands School were “quite good, ” as the girls said, and generally attracted a number of players. But some of the girls found nothing quite so satisfying as the moor, just beyond the garden hedge. When they had only an hour to spare, they sat among the boulders on cushions of heather, drinking in its sweetness as the bees did. When a holiday gave opportunity, they walked in every direction, picnicked on the open hills, and came back wind-blown and refreshed, ready to work better next day.