. KIG. 4. â VIERGE DE STEI,I,.\- Impressionists. However, the pigments used in paint- ing did vary considerably from period to period, and by applying his method to a large number of works of absolutely certain date, the investigator with the microscope was able to draw up a chronological list of pigments of the greatest utility. Microscopic study of the pigments of a given painting enabled one, then, in many cases, to determine its date and to declare whether any portions had been retouched by restorers. Advancing this excellent method one more step further, Professor Laurie t
. KIG. 4. â VIERGE DE STEI,I,.\- Impressionists. However, the pigments used in paint- ing did vary considerably from period to period, and by applying his method to a large number of works of absolutely certain date, the investigator with the microscope was able to draw up a chronological list of pigments of the greatest utility. Microscopic study of the pigments of a given painting enabled one, then, in many cases, to determine its date and to declare whether any portions had been retouched by restorers. Advancing this excellent method one more step further, Professor Laurie took micro-photographs of minute portions of ancient canvases, enlarged from R.\DIOGR.\PH OK THE " VIERGE DE .\ " SHOWING D.\>L\GEU PORTION WHICH HAS BEEN RESTORED. In the centre a bar of wood prevented complete passatje of the X rays. No sooner said than done. And thus, in 1914, the first researches concerning the radiography of pictures were made in Germany by Faber, as related in the Zeitschrifl fur Museumkunde. Dr. Heilbron, of Amsterdam, continued them with most curious results. Finally, between the middle of 1920 and the present date, we find a Parisian specialist. Dr. Andre Cheron, perfecting the method to such a degree that we are tempted to say the days of the picture forger are numbered. Dr. Heilbron's results must first of all be described. As the subject for his investigations he took a " Crucifixion," by Engelbrechtsz, a picture which was
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