Conflicting with this is the finding of Charles Rohault de Fleury, who, in his Mémoire sur les instruments de la Passion of 1870 made a study of the relics in reference to the criticisms of Calvin and Erasmus. He drew up a catalogue of all known relics of the True Cross showing that, in spite of what various authors have claimed, the fragments of the Cross brought together again would not reach one-third that of a cross which has been supposed to have been three or four metres (9.8 or 13.1 feet) in height, with transverse branch of two metres (6.6 feet) wide, proportions not at all abnormal. He calculated: supposing the Cross to have been of pine-wood (based on his microscopic analysis of the fragments) and giving it a weight of about seventy-five kilogrammes, we find the original volume of the cross to be 0.178 cubic metres (6.286 cubic feet).