A review by Vernon L. Kellogg, published in Science in 1907, of Mary Austin's book 'The Flock' (1906), which records her observations of sheep, shepherds, and sheep dogs in California. Kellogg quotes passages on flock behavior (leaders and followers, panic flight, bedding habits), the loss of native instincts through domestication, poisonous plants and water, and the training of sheep dogs. He argues that a literary nature writer's observations can still be of value to scientists.