It is stated that a diamond in the rough, as large as a pigeon's egg, has been discovered in Toulmac Co., California, which is to be ex hibited in Stockton and San Francisco, and then brought to New York. A correspon dent of the " San Francisco " Herald says it has been carefully and scientifically tested by Dr. F. Banks, a graduate of the Medical Uni versity of Louisiana, who pronounces, it, be yond all doubt, to be a diamond of very rare purity. It is said to be "larger than the Crown Diamond of England, which is valued at ten millions of dollars." This is rather too tough a story to believe without further evidence of its truth.