88 
Among the grasses, Phleum armarium and Sclerochloa 
rigida and loliacea are very common on and near the shore 
at Llandudno. The rarest species is Rnappia agrostidea, 
found in Anglesey on the borders of Llyn-Curon, which is 
the only known locality for it in Great Britain. It is a very 
small species, and, flowering as early as from the end of March 
to May, it may have been overlooked in other places ; it is 
extremely abundant on the grassy hillocks on the borders 
of the lake ; the largest specimens I found were about two 
inches in height, the general size being about one inch. 
In the foregoing notes I have only mentioned a few of 
the plants I met with in North Wales last spring. Speci- 
mens of many others are before you, and those who visit 
Llandudno a month later than I did will find very many 
more species, especially in the families Compositw and 
Gyperacce. 
''Some Remarks on Crystals containing Fluid / 5 by J. B. 
Dancer, F.RA.S. 
The Author gave a brief history of the discovery of fluids 
in crystals, including Sir H. Davy’s chemical experiments 
on the fluids and gases obtained from the cavities in quartz 
crystals ; Sir David Brewster’s discovery of the pressure 
cavities in the diamond, ruby, emerald, amethyst, chryso- 
beryl, &c. ; the existence of minute crystals in these cavities 
and the two new and remarkable fluids, which are immiscible, 
but sometimes found together in the same cavity— one a 
liquid hydro-carbon, named Brewstoline, the other Crypto- 
line ; his experiments and examination of artificial crystals 
