15 
Several colliery spoil heaps in the neighbourhood are being 
clothed with Caragana arborescens, Colutea arborescens, Rosa 
rubrifolia, common broom and other things, whilst in two places 
_ young plantations of the true cricket-bat willow were noted, 
In conclusion, I should like to express my gratitude for the 
kindness shown by all with whom I came in contact during the tour. 
III—ON THE GROWTH OF ULVA LATISSIMA, L. IN 
WATER POLLUTED BY SEWAGE. 
A. D. Corton. 
It is well-known that the marine alga Ulva /atissima, L. thrives 
in brackish water and in localities where fresh water runs into the 
sea. At the mouths of rivers and on muddy shores of estuaries it 
fermenting Ulva is later attacked by another species with the 
* .-9 Ra: Sees ee d hydrogen. 
These sulphur compounds are probably produced from the sulphates 
of the sea-water and not from the albuminoids of the alga, 
