New-York tribune., 1868-03-23
SCIENCE

F1vcrRor osrs OF TARTARIC ACID.-M. BOur-
coins memoir, brought before the frenen ncric
snrrcnt first on neutral tIrae OF potash see9hu, Vi
mixture OF neutral tHItiatc ana hh'l Hui 80. o
nosses only moderate dsengagCment0I OF gas ls louuccu
st both electrodes The ncgaye 3eCDnnS aS"r hi ON NJ
are evolved, and White percWtate is formed WHICH,
nv analysis found 10 be pure cream ol tartar There
i However some tartaric acid destroyed by oxydaton
The fundamental action ~ the same IN the secOu CdsV
80, The reslts are different I'm addition 10 the gases
mentioned, hydride OF ethylene. and acetyene hle
evolved from tho positive eeCrOde. In the uliuii
CarbOnic acid is largely predominant Ia the gases &
and acetc acid H. formed AT the positive electOds ~
Ale experiment had been in progress ioI hIe '' tid
10 contain large proportion Of acctic acd NH0" vas
separated a. acetate OF barytd.
MAMMOTH GLASS PLATE.-A single, pIaaIe %, Hs
glass has just been imported nom France INT to
i6 feet inches wide II II used not as & tiSc,t.
represent. under strong light. l"l.ni "l.i Iorc made
nv sensat,on by displaying tho poetry ci nolIpn.
glisterng ice ndin lslUS lS amnpr9Ied ~ 70 his ex-
tent why il shGuld not fly in pieces nlaft .ho W. ~ @
shanges Gf INV oss IS made Of such thickness
ns 10 resist very powerful dow but tt cn'Ct VI N ~
snaI heating which often cracks ironIlates as Wen aS
is. h NOT so great might be supposed; thc nuh'i o
f,et upon il at time does MOI exceed uoA'l Hi'
they arr not there long enough 10 produce any rv'u
bic change in the temperature OF the saSs Iheie J,
secret connected With tile manufacture 3i IaIEe E,I'
plates known only IN certain factories III fI1nCy ~ ~
sonparatVey speaking, an easy task 10 make pc' ol
enormous size,but toproduce thcmiIee Cong ',S
or, IN other words, perfectly tIonsl2i.nt unu
seus throughout has required much time ana many cA
permcuts the suTmOuutnC Of dliucuJts yet tl'ouu
tored IN other countries where glass IS Sl TOO mlte Is
probably the result of expert manipulation as well as
the addition Of new ingredients
EFFECT OF FROST on LARvE.-A paper ad-
dressed 10 the French Academy Of Sciences, by NJ;
Reset contained a statement that the general utIei
held by farmers viz: that severe frost Kills noNons III
seets and laryr which grub IN the calt s u iailivy
Emile Blanchard after COmphmcnng Reisct lor MS re-
searches said the fact well known to lal9ldHsls
that aryr feeding on renamed near the surface OF
the soil during mild weather, ana descended 10 greater
dcpths as the cold became more intense, SO ~ always 10
esapp tbc effect Of frost Mr Chccul said That Relset
had done good service in asccrtanme by precise expert
meuts at what DEPTHS according 70 temperature atF'v
WOnld he found i'm the soil While the Thermometer stOo9
at 10 c. below tie freezing point ahd the GROUND
was covered with snow, the sOh al u ueWu
Of so contimeters NEARLY 20 inehcs) was
NOT influenced 10y frost. After these experiments
Hr. Rcsct had told agricuturists mat they were We're
utterly II they trusted 10 frost FOR the plCelN
ton OF their crops from insects, and that they must exert
themselves if tley wished TO escape the mpenuins
scOurge. knowing that last Autumn the Wiute worm
Was stil near the surface he caused field 10 be sEny
plowcd and narrowed; and two persons following thy
harrOws gathered 344 hOrranmes Ot worms az COS Oi
u francs per hectaTc % acres rms htI louEtu d" an
excellent crop while that next 70 H. from WHICH Ho
worms were gathered, produced nothing.