The effect of antirheumatic drugs on the extractable collagen in lathyric chick embryos

The lathyrogenic effect of 2·5 mg of β‐aminopropionitrile in the chick embryo has been measured by the increase in the extractability of collagen from bones using M saline. Sodium salicylate (3 mg/embryo) and hydrocortisone (1·5 mg/embryo) applied 24 hr after the injection of β‐aminopropionitrile decreased the elevated amount of soluble collagen. Phenylbutazone, chloroquine diphosphate and sodium aurothiosulphate were ineffective in this experimental system.