The deformity herewith described is known as pes cavus or arcuatus, hollow or hollow claw foot. Clinically it is characterized by these cardinal points: 1 An increase in the height of the longitudinal arch. 2. A dropping of the anterior arch with plantar flexion of the front of the foot. 3. A variable amount of dorsal retraction of the toes, the claw foot deformity proper, with hyperextension of the metatarsophalangeal, and flexion of the phalangeal joints. The retraction of the toes is as

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... ent a part of the deformity as is the abnormal height of the arch; both features are, in fact, genetically interdependent.