You probably have never heard about this Johann Galletti. But probably you know the type of the absent-minded professor. Galletti was such a man, and for a long time he was the most known absent-minded professor in Germany. And so it happened:
Life of Galletti very briefly
Johann Galletti's father, Giovanni Andrea Galletti, was an opera singer of Italian origin. He was in service of the Duke of Sachsen-Gotha . Galletti, the singer, was married to a German actress, and on occasion of a guest performance in Sachsen-Altenburg this Elisabeth Galletti gave birth to Johann Georg August Galletti in 1750. Even though our future absent-minded professor was born in Altenburg, nearly whole the time of his life Galletti spent in Gotha (except of some studying and trainee years in Goettingen and Schlotheim). Galletti went into teaching on Gotha Gymnasium in 1778 and stayed there till 1819.
He was an acknowledged historian, besides he teached Geography, Latin and Natural-history. Although he was married twice, his real love was reading & writing, and reading & writing again. He published a World-history in 27 fat volumes, a German history (10 volumes), a Thuringian history (6 volumes), a history of the Sachsen-Gotha dukedom (5 volumes) and an uncounted number of other books and essays about history and geography. Between reading and writing about all the countries, regencies and wars, surrounded by bookworms, he became an odd bookworm himself, and the real live became hard to an increasing degree. When Galletti's thoughts made somersaults or went cross-country, he said some more and more funny peculiar things. His students did collect Galletti's stylistic howlers and tongue slips, and 1878, 50 years after his death, they were published first (and from then time after time). This "Galletiana" are the lighthouse of a small German literary genre named Kathederblüten (unfortunate turns of phrases, especially by teachers).
Some tasts of Galletti sayings
This probably is a premiere. As far as we know Galletti's howlers have never before been published in English. Particular thanks go to certain newsgroup participants  for their help in finding proper English wording; especially to Stephen Hust, Andrew Bossom , Arfur Million and Ray.
After the Battle of Leipzig you could see horses with three, four, or even more legs shot off running loose all over the countryside.
The islands of the Mediterranean are all larger or smaller than Sicily.
When Humboldt climbed Mount Chimborazo, the air became so thin that he could no longer read without glasses.
The African Lion usually grows up to the age of ten, and from then on, its size simply increases.
The angora rabbit is one of the strangest but most useful of insects.