AND LOCAL SCIENTIFIC INVESTIGATION. 
39 
II. Investigation of Subjects of Local Scientific Intebest. 
The Committees of the British Association doing local scientific 
work in which we can assist are the following:—In Meteorology 
that on the Temperature of Surface-water; in Geology those on 
Underground Waters, Erratic Boulders, and Geological Photography; 
in Biology those on the Disappearance of Native Plants and on the 
Cryptogamic Elora and Invertebrate Eauna of our Eresh Waters; 
and in Archaeology that on Pre-historic Remains. 
The work of the Boulder Committee has already been brought 
before our Society by Mr. Eordham,* and he and other of our 
members have rendered assistance to this Committee by giving 
accounts of the occurrence, etc., of boulders in the north and 
centre of Hertfordshire.! 
Several of our members are also carrying on investigations as to 
the circulation of water in the Chalk of Hertfordshire, and we 
have had from Mr. Eordham two papers on the height of the 
water in deep wells in the north of the county. { 
We have thus aided two of the three geological committees 
mentioned, and in view of the recent addition of photography to 
the subjects of study by our Society, this paper is followed by one 
showing how we may aid the third geological committee, that on 
Geological Photography. The work of some of the other com¬ 
mittees may possibly be discussed in future papers, but it may 
be well to partially anticipate these by giving here some information 
with regard to the investigation of certain subjects of local scientific 
interest. 
A ‘ Circular referring to Subjects recommended for Investigation 
by Local Scientific Societies,’ drawn up by the Committee of the 
Conference of Delegates, was issued to the Corresponding and other 
Societies in 1882. As the Committee then consisted only of Mr. 
Eordham and myself, no apology I think is needed for making free 
use of this Circular. In it information was given as to the work 
of three committees of the British Association, and three subjects 
investigated by other societies or by individuals. One of these 
committees, that on Underground Temperature, I am informed by 
its Secretary, Professor Everett, E.R.S., has almost concluded its 
labours and no longer requires assistance from provincial societies, 
and I therefore omit it. On the other hand I have six subjects 
to add investigated by committees which have been appointed 
since the Circular was drawn up, and one subject to add to those 
investigated by other societies. On account of this largely-increased 
number of subjects to be discussed, I have thought it desirable to 
give little more than a list of subjects for investigation, and the 
* ‘Trans. Herts. Nat. Hist. Soc.,’ VoL I, p. 163. 
f R. P. Greg, ‘ Trans. Watford N. H. Soc.,’ Yol. I, p. 172; H. G. Fordham, 
ib., Yol. II, p. 249, and ‘ Trans. Herts N. H. S.,’ Yol. Ill, p. 33; J. Y. Elsden, 
ib ., p. 47. See also H. G. Fordham in ‘ Rep. Brit. Assoc.’ for 1883, p. 143, and 
R. T. Andrews, ib., 1885, p. 323. 
X ‘Transactions,’ Yol. 1Y, p. 20; Yol. V, p. 31. See also ‘Rep. Brit. Assoc.’ 
for 1889, p. 85. 
