1.1858] THE AGRICULTURAL GAZETTE. 1 
,and the value of which is RA such а point 1 hat is the reason that wet, undrained soils, are always made u up, be explained without а know ledge of theoretical 
of incon one ie . л T 5 аа teal | 5 Under "n — is the r of dew greatest, | chemistry! ? How could the iir ersion o n and cake 
doubt it, is that in sowin | and why is n ights int t explained ? m could the 
bushel of Wheat is represented to be a foolish and | A wi pat. is the. weight i in md . — bloc k of Fir wood, | prineiple implicated in respiration and other processes 
ie af h no By à mistake in the © attaining 50 cubic feet, the specific gravity of the iod being 25 she — d? 
culpable waste of nun А е ituation to „ and 1 cubic foot of water weighing 62 ken 9 animal economy be un МА » How could 
execution of my directions, I am ae in a situation to | As X the reasons why the study of agricultural chemistry | on of manures upon soils crops and ¢ crops upon 
ow what are the effects of rving this maximum | will but slightly benefit the ag раат! student, if it ,has not 2 be explained ae ренеп chemis ony“ 2 
soils, except by an ері Д inference ; but | | been К by 2 — of pur chen | Indeed, there is not one step.in chem 
d : pecks were tried ; 5 produced 32 bush s 5 - characters нон distin guish * made wit ihent, a oe of the ponies of of — 
> xture 
of corn an 85 tr f straw ; 6 and 7 were some e by i vae that the knowle ча e of th ча of science. Am o more under ultural 
better, but 8 produced, in one instance, 36 bushels xe chemical equivalents is D practical utility to the farme ү. | che eminet; or p n the phenome ee with 
7 trusses; а nd in another, 46 bushels and 140 trusse 1| Pag are the general properties of acids and of basic sub- | u n his farm or in every-day life, —— —— 
sup ontend ун * the 1 ofs Sel 3 December 13, 1852, | — e chemistry, than a surgeon can treat 
ро uri — tient without à knowledge of anato — 
had been ee by a whole bu avo a pa ge my, so in y 
: have been produce L. are the t 
maximum, t amount wou | 'ound up tog к. 
in fact, if the recommendation f very thin-seeding were 1 i D he piunt ot waiter pe ‘contained i in the 8. A ical sime und possesses fixed proportions ; 
on any sound principle, мех from the questions | atmosphe ay be аі пе by 2 ssing a certain p 2 formed by the union of two or more substances, by 
2 i in 
M 
of soil and сонраки which 
r the seed be thick o 
its answer might be well, 
Parador. M 
Reply. thes жор бер 
It is possible: 3 сы ang 
xp 
1 1441 11 
reater, were it none at all. 
Ф 
[^] 
£e 
e 
hoes ; ‘at if it be too thin, 
experi- | 
be too expen- | 
— er roots, 
usplant eaeh separ ould r require 
оар “fore of p labourers 5 “ht ki 
very year 
— the bad 
n a 3 of ground devo 
experiment with phosphate of sida, fr fro 
the vacancizs in spri ng . 
ut they were filled u 
; It ma rth eee A the | 
= ag — been adopted е ery year 
enced nine y 
Wheat P intermediately о uie same so 
the straw produced his. year on 32 rods, 5 of w 
—— no manure of any deseription, and the rest 1 no 
farm-yard manure during the whole атра fell 
ола latter oe 
me with a septi to thos 
utili repeate 
— 
the possibility that too much sulphur 
Seen accumulated in the soil by the decomposition of 
the acid; for I have ascertained by previous experiments | 
that a small amount of po — sulphur mixed with 
the soil is injurious to vegetat 
Lastly, the same — deters me from laying | am 
g,on whic 
bl them to indt 
expenses to enable apply it to 
> reese ins -— I have never doubted | of i ; but 
this year trials 
the drainings from the stables laid on — 
Proportion of 280 gallons, — with an equal quantity 
| water, and neutralise 56 lbs. of sulphuric as Od. 
i at 13s 
that Bab" is lo эи mea na L. Vernon 
Harcourt, —— za ^ 
225, — — — 
ROYAL AGRICULTURAL COLLEGE. 
SESSIONAL EXAMINATION.— NATURAL PHILOSOPHY AND 
GENERAL CH EMISTRY. 
e year 2 can Baked | et 
s indeed a remedy, tu 
which absor 
“whieh, vw азыг of entering “shee soil, is 
ihe dr rying 
m | apparatus ; deri by placi ng а certain oda bell-jar over 
sulphu nerally done vy 1 
gr Manon) s wet bulb 
d 
? 
upon сна. and з aS 
Be a of cold. 
a piece of ба, kept co thy a 
e: connexion "with a ajar — E | 
uic einai’ “the | 
te t 
atmosphere, which also evaporation, is note 
ir ence alge eine and by m e ee and by 
ns of tables, so mount of moisture is calculated, 
bas one bul, filled partially with 
th 
e 
ы к апо 7%, to show tenpera- 
rument, ether is poure 
ound a 
rag ; evaporation 
- condensed i in the bulb, and the ether from th the 
3 0 
The d 
, and that e ага 
| with Jh ЕТ the dew point, t, and pde T 
of v. n atmosphere. Pieces of ha , have 
hygroscopes, as they саны іп * and 
ing in 
dm substance can oceu deve ~ 
i is seen 
ight it exercises 
| pressure on the sh equal PH 
per square inch ; it is elastic ge 
nairgun, These are some of —— гне тан і 
operation upon de pressure. sofa 
ass tube filled. with MDC GET: which has € d 
1 | formatio 
overed 1 
heat of m 
d 
eds 
piece of 
is 
У | possess a 
nion 
hieh осад deir characteristic properties are be and 
A. 
ЕЕ 
0 
heat is (iiri Mg evolve — the 
n of * compound. The n ee formed 
cannot be separ гаоч аб again unless by chemical means. 
amixtu tis evolved no new substance 
i b 
pe — 
formed, the 
distinguishable ; no 
the substances ean be easily separated by —— 
eas 
9. The practical = attendant upon the knowledge 
of the doctrine of equivalents is nn for it is 
only by th stum imei that the farn mist 
know how much value a substance ies eo — is its 
exact composition, and 2— weight of each substance it 
these 
HE 
“s amount of peti acid (S 9,), ичо to fix 
mmonia (N H, O), is known. Take for ce the 
— required of sulphuric acid to fix 1 pw of, car- 
bonate нор 3 (N H, О C O9, in gas liquor or in 
liquid m 
T "1 Then as 48: 40 =128 Оз required 
mE ad 6: 5=1 
1 
48 | 
SO, = 40 
NH, O = 26 NH 
66 
6) 5000 e 
825 Ibs. S Os —€— 
10. Acids for the most part are 
talloid in combination with en or ad гика; іп 
oxygen acids, the acid is generally іп excess—in 
gen acids. — 2 obtain, i. e., one о ae 
Aci sharp acr e VE and combine with 
bases to form salts. Sucha 
18 
temperature are strongest "ne a "high o 
en | mostly, x рен, blue litmus 
are the 2 oxygen with a pes and where base 
8 anganese wit zx forms — 
Ld neu ten], га acid oxides, depending upon 
of oxygen in combination with metal ; E soluble р 
апа tastes colour red litmus blue, 
soapy feel 
ed 
and combine with acids form 
is fille d, and inserted i ntoa 
u ube 
mercury at base. MNA is 
a high specific gravity ; a short tae 
it is — 
change. 
atmosphere 
of € &c,w 
sieht 
earried off by 
verting the water into vapour 
VS The аме gee ч dew is greatest when the we has 
e ly. 
air become heated, | 
since a an ele e tore water i held in 
Ae soil too becomes heated ; 
night, then, when the rature 
soil by ees gives off its heat and 
down lower than the ai 
y мету from = vg ga 
clouds, and thus Кен at is 
B = .47 x 62.5 lbs. x 50. 
= 1468.75 lbs, 
chemistry, theoretical and | 
intimate relation with one. her ; 
dt is perfectly impossible. to under- 
chat take place in substances under 
stand the dpt 
ys to Lach pipes, and a 
соо 
Mss P air being no longer so| 
during cloudy pp is 
ome Борн. 
Stoppage of Drains.— o thank you for your 
notice of my communication bebe neal the Mang: 
roots, and without further i gap shall proceed to give 
you the results of su I haye 
take whol 
all of x qase: А have 
ane, choked up 
som 
pipes completely up, and am relaying them, and a very 
it is, . well imagine but 1 I 
eoncur with Mr. Paget in 
the 
pss 
find anything like the 
subsoil ів-ајау, the amount of obstruction seeming to 
e gravel in the спеў ] "таймау 
appears. There із а footpath 
ТЕ 
are few. articles of ordinary consump- 
tion which, more effectually promote e the sa age p а 
аррагеп 
fluid, it will not be seen 
contains quantities of ce 
are fertige to a chemically. pure water, one of арн, 
herio $ 
ыд, 
x9. ‘Mention the 
aw 
ve a 8 on of the barometer, and briefly state 
wie pred — are made of this Instrument. 
composition aud the anden ee, the constituents of | 
could the $ 
* 
else 1 San pit-coal pa burnt, this water is 
phenomena, of which P" pres of реше is 
be contaminated with L oca from Rec. and other 
