acIdT The results are expressed in terras of grains of oxaTic 
acid per gallon. For example : the water of Peter-street 
pump is returned as containing .306 grains of organic matter 
per gallon. This means that the organic matter in a gallon 
of that water requires as much oxygen for its combustion 
as .306 grains of oxalic acid. All waters must be regarded 
as unfit for domestic use which contain more organic matter 
in the gallon than is equivalent to .5 grains of oxalic acid. 
Fourth— The following is the list of waters examined, with 
the results of their examination in grains per gallon^ and 
the date on which the sample was taken 
Organic Mineral 
Matter. Matter. 
1863, July 31 fit, Peter-Street Pump ,3(t6 ,. 116.4 
Aug. 4th, Wine-Btreet F 192 .. 98.7 
„ 7th, All Haints' Conduit .. .171 ., 72 6 
„ 7th, Market P 443 ., 91.0 
,, 14th, St Thomas P. .. .170 .. 84.0 
„ 17th, Temple C 21u .. 33.6 
„ 19th,* Jacob's Wells, W... .757 
Organic 
Matter. 
1864. June Ist, Jones's-court, Frogmore-street, P. 
„ Ist, Pithay P. 163 
„ 2nd,* The Paddock, Easton-road, P. .736 
„ 2nd, Bedmiuster-down P 430 
„ 2nd, iNelf^OQ-court, Bridewell-street, P. .. .350 
,, ord, Kent's-builditigs, Frogmore-st., P. .. .121 
„ 4tb,* Vlne-row^, Old-park. F. .. .648 
„ .4th, Albert-place, Horfield, P. .. .. .121 
„ 6th, Colston's Almshouse, St. Michael's,?. .158 
„ 6th, Almshouse, top of Christmas-steps.P. .127 
„ 6th, Albion-chambers, P 418 
„ 7th, Princess Amelia-court, P. .. .. .220 
„ 8th, Boar's Head yard, Liraekiln-lane, P. .148 
„ 8th, Madox-court, Frogmore-street, P. .. .224 
„ 9th. Pipe-lane P 274 
„ 10th,* Victoria-place, Bedminster, P, .. .610 
„ 10th, Union-place, Cathay, P 176 
„ * lOth,* Hill-street, Narrow-weir, P. .. 1.125 
„ 11th, King's-parade, White Ladies', P. .. .279 
„ 11th, Gloucester-terrace, St. Michael's, P. .167 
„ 13th, Edward-street, St. Philip's, P. .188 
„ 13th, Meridian- vale, Clifton, P 128 
„ 14th, Armoury-square, Stapleton-road, P. .285 
„ 14th, Berkeley-court, Berkeky-place, t*... .138 
„ 14th, Michael's-buildings, Paul-street, P. .180 
„ 15th,* Red Lodge, Park-row, P 742 
„ 15th, Bedford-place, Terrell-street, P. .. .273 
„ 16th, Frost's garden, Newfoandland-st, P. .248 
„ 16tb, Nelson's-place, St. Philip's, P. ., .165 
„ 17th, Lower Belle Vue, Clifton, P. .. .243 
Fifth — The water, which the examination has proved to 
be unwholesome, is marked with an asterisk. Sixth — The 
amount of mineral matter has been determined in the case 
of the first six on the list. In the case of the first five this 
amount must be regarded as objectionably large. Seventh 
— The water of the Bristol Company was examined in the 
spring of 1863 and found to contain thirteen grains of 
mineral matter and one-tenth of a grain of organic matter 
per gallon, which proves it to be an exceedingly pure and 
good water. 
The Hon. Secretary having made this communication, the 
Hon. Treasurer, Mr. Stoddart, exhibited some large masses 
of the metal magnesium and wire made of this metal, 
explained the method by which it is manufactured from 
aea water, briefly mentioned its properties, and showed the 
intense light produced by the burning of the magnesium 
wire. 
The President then called upon Mr. Charles Ottley Groom, 
who read a continuation of his paper on the nidification of 
j British birds, which he copiously illustrated with examples 
: of their nests and eggs, some of which were handed round 
\ for inspection. He confined himself to describing the breed- 
ing habits of those which breed in Britain, and adverted to 
those of most of the warblers, accentors, buntings, finches, 
chats, larks, pippits, tits, wagtails, climbers, swallows, and 
doves. Mr. Groom said that eggs, by their colour and mark- 
ings, often assist the classification of geseraand species. He 
described the breeding of Savi's warbler, Sylvia luscinoides, 
