利用粘土的力量》，詹姆斯-C-西尔弗索恩著

Silverthorne applied a warm boiled-clay poultice to one mare and, separately, cement kiln dust (CKD) to ecologically managed pastures. He reported wound recovery in the mare and denser grass and clover in the pastures.

On 10 acres of ecologically managed pasture, he applied CKD at an average of 1.5 tons per acre one autumn and observed denser, taller grasses and clover by mid-May. After another application the following autumn, he reported strong grass production for about six years.

He describes the clay poultice and cement kiln dust (CKD) as heated mineral materials in two separate accounts, and relates them to biodynamic preparations, which he describes as nonheated materials for specific agricultural uses.

In his one-mare account, a veterinarian first examined the wound; after Silverthorne applied a warm boiled-clay poultice, he reported greatly reduced swelling and pale-pink new tissue about three hours later. He said the mare had regained her previous gait by the next spring.