acid^ The results are expressed in terras of grains of oxalic 
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 untit 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 cjaUon, and 
the date on which the sample was taken : — 
Organic Mineral 
^ , _ Matter. Matter. 
1863. July 31 St, Peter-street Pump .306 .. lie. 4 
Aug. 4th, Wine-street P 192 .. 98 7 
I „ 7th, AU Haints' Conduit .171 72 6 
1 „ 7th, Market P 443 91.0 
„ 14th, St Thomas P. .. .170 84.0 
„ 17tli, Temple C 2li> ., 33 6 
„ 19th,* Jacob's Wells, W... .757 
Organic 
Matter. 
1864. June Ist, Jones's-court, Frogmore-street, P. ., .ves 
„ l8t, Piihay P. 163 
„ 2ncl,* The Paddock, Easton-road, P. .. .736 
„ 2ad, Bedminster-down P 430 
„ 2nd, IN elt^on-court. Bridewell-street, P. .. .350 
,, 3rd, Kent's-buildinge, Frogmore-8t., P. .. .121 
„ 4th,* Vine-row, Old-park. P 648 
„ .4th, Albert-place, Horfield, P 121 
„ 6th, Colston's Almshouse, St. Michael's, P. .158 
„ 6th, Almshouse, top of Christmas-stepSjP. .127 
„ 6th, AlbioQ-cliambers, P 418 
„ 7th, Princess Amelia-court, P. .. .220 
„ 8th, Boar's Head yard. Limekiln-lane, P. .148 
„ 8th, Madox-conrt, Frogmore-street, P. .. .224 
„ 9th, Pipe-lane P. 274 
„ 10th,* Victoria-place, Bedminster, P. .. ,6i0 
„ IQth, Union-place, Cathay, P 176 
„ * 10th,* 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, Berkeley-place, P.. . .138 
„ 14th, Michael's-buildings, Paul-street, P. .180 
„ 15th,* Red Lodge, Park-row, P 742 
„ 15tli, Bedford-place, Terrell-street, P. .. .273 
„ 16th, Frost's garden, Newfoandland-st,, P. .248 
„ 16th, 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 1868 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 
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 egg.s, by their colour and mark- 
ings, often assist the classification of gcReraand species. He 
described the breeding of Savi'a warbler, Sylvia luscinoides, 
