^ the East and West Seas. „T1 
Observations at Grangemouth on the Frith Forth: 
1821. Feet. In. Feet. In. 
Oct. 13. High Water, 144i6, Low Water. 162.6 belpw summit level. 
Nov. 1. A gale^from W, do. 152.6, do. not specified- do. 
Nov. 3. Fresh breeze from S. do. 152.6, do. <io. ^^o. 
The Superintendant of this district considers die tide of the 
13th October to be nearly two feet higher than the. average, and 
those of November to be much lower. 
From all I can learn from the persons employed about the 
two extremities of the Canal, I infer that the descent on the 
west end from the summit-level to average half tide, is 155.10, 
and that the descent at the east end is somewhere between 154< 
and 155 feet 
I may here notice that the effect of wind in altering the level of 
the surface of water, is strongly exemplified in the reach which 
forms the summit-level of the Forth and Clyde Canal. This 
reach is about eighteen miles long, nearly in a straight line east 
and west. When a westerly gale has blown for some time, the 
action of the wind sweeps away the water from the west end, 
sinking its surface, and accumulating it at the east end, where 
it escapes over the lock-gates in a stream sometimes ten inches 
deep. 
The observations of the tides at either end of the Canal ai^e 
to be continued for some time, and if I should find that the ave- 
rage differs from what is taken above, I shall communicate the 
result. I am, dear Sir, yours very truly, 
^ John Robison. 
Art. XII.- — A Monograph of the Genus Erineum. By Robert 
Kaye Greville, Esq. F. R. S. E. M. W. S. &c. Com- 
municated by the Author. 
The genus Erineum is so distinct from all other known ge- 
nera of fungi, that none can possibly be confounded with it 
At the same time, it would be extremely difficult to give a sa- 
tisfactory account of its physiological structure. Our knowledge 
of these minute plants is at present so limited, that even to at- 
tempt to describe it would be imprudent. I sh^ll therefore 
