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420 Scientific Intelligence. 
radiation is tovreduce the temperature of vegetation, &c., not more than 
2° Cent. below that of the surrounding air. The dampne ss of the air is 
such as readily to allow of the deposition ‘of dew with even this small 
change 
ther i important conclusion of our author, is a confirmation of the 
law a announced by Wilson, that the loss of heat —_ “oeneeey in a 
calm, clear night, is uniform at all temperatures of the a 
The sree le of this investigation, while it corrects pa ‘inaccuracies 
and improves the methods of experiment, in every respect confirms the 
theory of dew, laid down by Wells. G. C. ScHaEFFER. 
2. On the pat sn oma the Organic Alkalies; by M. Aue. Lav- 
rent, (Ann. de Chim. et de Phys., May, 1847.)—This distinguished 
shemist has sliced the vegetable: alkalies, since much uncertainty 
; prevailed as to their true formule, and as or many o of them, formule 
have 
been oie sat heeeadian to the views of M. Laurent, can- 
not represent any pound. The error in most cases arises 
= fact, i a aiflerence of -002 to ‘003 of hydrogen is sufficient 
nge their constitutio 
kan sarees of a mrodiication of the usual process for organic analy- 
has found that he can determine the hydrogen to 001. By this 
process, the following formule were establishe 
We give the ogee adopted by the author, as a translation to our 
system would in some cases involve: the use of fractions. It is only 
oe to seienaaiae that Hy and N, of the French authors, are H and 
with 
Quina C,,H,,N,0, Narcogenina C NO 
Cinconia C,,H,,N, oO Opiant acid cher : 
Morphia C,,H,,NO,  Opianate of amm. €, oH we 0, 
Quinoleina C, H, N Hemipinie acid epee Oe 
phi Canetti Ns Hemipinate ofam.C,, ae N, Og 
icryle H, ;O, tarch ee ¢ Pe a 
Narcoting C,,H,,NO, ~-Pyroxyline. , C,,H,,N, O27 
Cotarnina G3. HN 0, oni sar: 
-C.5. 
3. eeeeciee on the Chemical Sane of Asparagine and As- 
partic Acid; by:M: R. Pairta,((Ann. de Chim. et de Phys., Feb., 1848, 
trans. aoe te sled: )—The shat ptestee of M. Piria’s remarkable 
discoveries in relation to these ~— —_ already from time to 
time appeared in various journals ;. but w w for the first time find 
| ™ complete memoir, of which we shall jane a brief abstra 
were allowed termini ina snigeniionte When the plants 
hese were purified by two or three re-crystallizations from 
of uncommon beauty, not unlike those of sugar ¢ cnn . Copper vessels 
impart a blue tint, and sulphuretted hydrogen causes me to disappear. 
The product of asparagine i is er. per cent. for the ve The 
same quantity was obtained from the plants germinated | in the light ; 
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