Now, as green sap ascends the steepled wood, Each hedge with such white bloom astounds our eyes As sprang from Joseph’s rod, and testifies How best beauty’s born of hardihood.

Another instance in which Mediterranean sapropels have provided clues about events deep within the African continent is the ‘greening’ of the Sahara about 120,000 years ago.

In a quadratic field Q (√), D a squarefree integer, with class number 1 any algebraic integer can be decomposed uniquely into primes but for only 21 domains Euclidean algorithms are known. We prove that for D<-19 even remainder sequences with possibly nondecreasing norms cannot determine the GCD of arbitrary inputs.

If C is reducible, we compare its gonality to that of its irreducible components.