Here this German come up with the same idea of periodicity of which there were hints already before But he doesn't like the predictions like Mendeleev does.
Ένας Γερμανός σκέφτεται την ίδια ιδέα της περιοδικότητας αλλά δεν κάνει τις προβλέψεις του Μεντελέγεφ.