200 REPORT—1874. 
angles, weathered in spurious conchoidal forms. (2) Fine- grained white fel- 
spathic stone with somewhat slaty fissure ; rolled on two thirds of its surface, 
weathered and fissured on the other. 
4. Moved. 
Note.—Gorphwysfa is 336 feet above the sea-level on the western slope of 
a hill 500 to 600 feet high towards the vale of Conway. The soz of the hill 
and neighbourhood is Boulder-clay on the Denbyshire grit and imperfect slates. 
All the old walls and hedge-footings have boulders built into them; and the 
foundations of my own modern house include a large number, some from Pen- 
y-bryn. At Cae-Mellor Farm near ten tons were removed from two acres 
in rounded masses reaching a diameter of 3 feet of varica. 
6. Conglomerates. On the mountain-top opposite this, between Llanrwst 
and Bettwys-Coed, I came across a boulder of red porphyry. 
8. Height above the sea 336 feet. 
Sixth Report of the Committee on the Treatment and Utilization of Sew- 
age, consisting of Ricuarp B. Granta, C.E., F.G.S. (Chairman), 
F. J. Bramwe.., C.E., F.R.S., Professor W. H. Corrizxp, .4., 
M.D. (Oxon.), J. H. Girpert, PA.D., F.R.S., F.C.S., W. Hors, 
V.C., and Professor A. W. Wittiamson, Ph.D., F.R.S., F.C.S. 
Durine the past year the Committee has been able to continue its observa- 
tions on the amounts of the various crops obtained at Breton’s Farm, near 
Romford, but has not been able, from want of funds, to continue the regular 
gaugings of the sewage and effluent water, nor to have any more analyses 
performed ; so that neither the quantities of sewage and effluent water nor 
their composition can be given for the past year. 
It has been thought desirable to keep the corresponding Tables numbered 
as they have been heretofore; and as Tables I., II., and III. cannot be given 
this year, Table IV. is the first, and shows, as it did last year, the kind of crops 
grown on the different beds of the farm, the dates when sown or planted, 
and when cut or gathered, the total produce, and the produce per acre, with 
other particulars, but does not show this year the approximate amounts of 
sewage applied, nor the number of dressings which each crop received. 
Table Y. is a summary of Table IV., the acreage of each plot being given, 
the kinds of crops grown, and the total amount and amount per acre for 
each plot; it only corresponds to a small part of Table V. of last year. 
From it we see that 2353:43 tons of crops were taken off the farm from 
March 25th, 1878, to March 24th, 1874, this being at the rate of 21-7 tons 
per acre. In 1872-73 only 1704 tons were taken off, as against 2714 tons 
during 1871-72; and this was, as explained in last year’s Report, due 
partly to the fact that a much larger amount of crop was standing on 
March 24th, 1873, than on the same day in 1872, and partly to the fact 
that cereals were much more largely grown in 1872-73 than in 1871-72. 
In Table VII. these particulars are given for the past year; and a com- 
parison is also made with the two previous ones; from which it appears 
that the area actually fallow on March 24th, 1874, was nearly the same as 
that on March 24th, 1873, and very much less than that lying fallow on 
March 24th, 1872; from which it might at first seem that the amount of 
standing crop left on March 24th, 1874, was about the same as that found 
on the land on March 25th, 1873, when the year began as far as the records 
are concerned ; but it must be observed that the land sown with spring wheat 
