Pièce 96 - Letter from John Herschel

Collingwood - 'Cooke's is in the 5th vol of the Memoirs of the American Academy of Arts and Sciences [Josiah Parsons Cooke, 'The Relation Between the Atomic Weights', 1854] Whether his classification is a great new step you are a better judge than I am - It was new to me when I read it'. JH gives a brief review of Cooke's theory and those working in the field. JH would be obliged if WW could send him half a page explaining capillary attraction.