Maguelonne Toussaint-Samat asserts, in her History of Food, that "the Chinese may be credited with inventing a device to make sorbets and ice cream. They poured a mixture of snow and saltpetre over the exteriors of containers filled with syrup, for, in the same way as salt raises the boiling-point of water, it lowers the freezing-point to below zero."[8][9]Some distorted accounts claim that in the age of Emperor Yingzong, Song Dynasty (960–1279) of China, a poem named Ode to the ice cheese (詠冰酪) was written by the poet Yang Wanli. Actually, this poem was named Ode to the pastry (詠酥; 酥 is a kind of food much like pastry in the Western world) and has nothing to do with ice cream.[10] It has also been claimed that, in the Yuan Dynasty, Kublai Khan enjoyed ice cream and kept it a royal secret until Marco Polo visited China and took the technique of making ice cream to Italy.