The snowdrop which may be seen in the Swiss Alps is the common snowdrop. Its Latin name is Galanthus nivalis.
In some parts of Europe, snowdrops may flower as early as January.
Rye is a crop grown in many countries throughout the world, especially in Russia, Poland and Germany.
Rye bread, made with various amounts of rye flour, is popular today in countries such as Russia, Poland, Austria, Finland and Denmark.
Click here to see a rye bread recipe.
As Heidi was written in German, some translations keep to the German way of saying things. So, in some versions of Heidi, Mr Sesemann is called Herr Sesemann, and the housekeeper Miss Rottenmeier is called Fräulein Rottenmeier.
Johanna Spyri wrote Heidi in two parts. The first part is called Heidis Lehr - und Wanderjahre ('Heidi's years of learning and travel'); the second part is called Heidi kann brauchen, was es gelernt ('Heidi makes use of what she has learned').
Click here to see the German version of Heidi.
It is high in vitamin A and vitamin D, and has traditionally been given to children to keep them healthy.
Most people do not like the taste of cod liver oil. Nowadays it can be taken in tasteless gelatin capsules. When Heidi was written in 1880, it would have to be taken from a spoon.