Letter, from George Robert Waterhouse to Sir John Herschel, dated at British Museum Autograph letter signed by sender. Consulted A. C. L. G. Günther, museum ichthyologist. Answers John Frederick William Herschel's question about poisonous herring Clupea thryssa. [A. K.] Johnston's Physical Atlas attributes Ruminants article to GW, but GW wrote only Rodentia article. 25 March 1869