Coca Cola Hearm.By Associated Press.Chattanooga. Ten 11. March 23.— Dr. J. A. Wessner. of the Columbus laboratory, Chicago, resumed his tes timoriy of experiments with caffeine no rabbits at 'ho opening of the i morning session of the case instituted b the government against 40 I aTeis and 20 kegs of coca cola today.Based on £ he results of experiments, he gave it as his opinion that humans having acquired a tolerant e of caffeine are less likely to be affected injuriously than would be the likelihood arising from doses of the drug to rabbits. He testified! *la' rabbits fed over a period of ! loo days more than a grain of cat ; frine a day, fattened and were found to be in noi mal condition j when killed.He gave his opinion as an expert that the normal human might j use as many as 20 or 23 grains a lt;»a' without seriosuly injurious ei-i fecis Dr. Wessner described .hi:*| experiments on a healthy young man ; with caffeine. The subject was giv-i en a total of 13 grains of caheine during six days with no ill effects.On cross-examination Mr. Miller ! presented a letter Dr. Wessner badwritten to the coca cola company defining his first analysis of coca co-| la in 1 f*n7 m which he had said he found no trace of alcohol or cocaine, although in latter experiments alcohol from .48 to .59 of one per cent was found.