Hoyt & Roberts, comps. Hoyts New Cyclopedia of Practical Quotations. 1922.
Blood
Le sang qui vient de se répandre, est-il donc si pur? Was the blood which has been shed then so pure? Antoine Barnave, on hearing a criticism of the murder of Foulon and Bartier. (1790).
Blood is thicker than water. Attributed to Commodore Tattnall. See Eleventh Ed. of Encyclopedia Britannica in notice of Tattnall. Vincent S. Lean stated in Notes and Queries. Seventh S. XIII. 114, he had found the proverb in the British Museum copy of the 1797 Ed. of Allan Ramsays Collection. (First Ed. 1737).