TRANSACTION'S OF THE SECTIONS. 
' 77 
wted with sal-ammoniac, and the author considers that it exists originally beneath 
tit surface as a nitride of boron. When steam is passed over this compound at a 
»xleriite red beat, it is completely converted into boracic acid and ammonia, which 
wfor the most part volatilized with the aqueous vapours. This theory of the fur¬ 
cation of boracic acid was considered by the author substantiated by the analysis of 
tb slag beneath and the snow-like mass above. The former contained nitride of 
keron, and the latter boracic acid and ammonin:al salts. 
On the Effect of Coloured Media on the Growth of lied Alow. 
By R. Warington, F.C.S. 
On the Artificial Preparation of Sea-water for Marine Vivaria. 
^ By G. Wilson, M.D. 
•'th( l ^w| Wa8 rxT Cr * t * C, ' sin . on a con,mHn ication made by Mr. Gossc, and contained 
rmlovodoM S °i , "f. 1 ^ HistoryGuiding liimself In Scliucitzer'sanalysis, Gosse 
• °"r' e °f sodium, sulphate of magnesia, chlcrrtne of magnesium and chloride 
■ n 0 a m,Xe d aqueous solution flf tin s • -all-. (fosse introduced various 
Ucuirn s jj: . nine, Buijniair ill mm , |iiKmj>uaic «u mm*, nuui me 
‘'■-■^nre fni.n,i’i 10au '^ an< l bromine—should not lie absent. n< these latter snb- 
:-1c 4fire fniin/l i • orormne—Biintun not lie anseill, ns these inner suo- 
Ac medium .V T-\ ,le t plants and animals; nnd it i* therefore plainly evident 
'‘•-'•e, quitenonaihlft W »i .- t lC ^ *' V0 m, K 1 't to contain the same substances. It is, of 
1 iu >l« might flimt.t , m U s ‘ n S* L ' aquarium the death of a certain portion of the 
’•^eri; nil( j j„ yV calcareous salts, ,Vc. for the growth nnd preservation of their 
^ {3 > bromide* x. * n ®? nev tbe death nf a given number of plants might liberate 
^’Pants of the’fim. ° r l 1 ' e vc *tnainiler. But this destruction of pail of the 
‘ r "H is calcnreim 'l*" 1 , r ^ l0 P' cservation of the other part might be easily 
TV' 5 ’ an d many lim ♦carbonates and fluorides occur together in shells, 
tlie bottom _?,, onos ' T»«o arrangement of fragments of such culrnreous 
I'iccea of in. t r a< l Uft cium would supply nemo of the missing ingredients ; 
“finder. ’* 0c ft nd a few grains of an iodide or bromide would afford the 
On the Sewerage, of Manufacturing Towns. 
analysi, ~ ^ tuancis Wrightson, J * h . D . 
) ils made bv TV xxr ■ , 
formed near ' VVri £‘ , tson of a natural deposit from the sewerage of 
Wiy a ]« a bseiice of all * C on \bouchnrc of several sewers opening into the Rea, 
h lojcj,] 3 "1* phosphates 1 | llm,)ni acal salts, and the scarcity of phosphates, pnrticu- 
"•pWei ' ro,, i also of at 1 10 aanic l ' ma the presence of a large quantity of 
•4 "■ .These inetnlli/. ,nC i Co PP er > ar) d other metals in the state of oxides and 
' generated u i \ n l ' lc sowers absorb the sulphuretted hydrogen 
vdv p. _ t° promote the 1 , * Vegetable and animal matter, nnd doubtless 
>U.rr Cent -ofniw: a th ^ u ’ t0 ' vn - The deposit contained when dried 
° l *° or tV,° P roto »de of 0 ;,. , 0t . n ,® a,I V non ' a ) and 3\ r > of earthy phosphates ; but 
l0r r Kj rnti 01 . fee l lf; r cent. ’m. U> uai “ es *iuc, copper, ami other metals to the extent 
a, 'd other bodion ; uul,, °r hoped these facts would not be lost sight of by 
n crested in (economizing town sewerage. 
