Scientific Intelligence , — Chemistry. 171 
bined state in those grasses which have the delightful smell of 
fresh hay, as the Anthoxanthum odoratum and Holcus odoratus , 
two species favourite articles of food with the horse and cow. 
The benzoic acid in the urine of the newly born child, may pos- 
sibly be derived from the milk of the mother. If the grasses 
above mentioned should be found to afford so much acid as to 
allow of its being economically extracted, they may furnish the 
arts with an expensive article heretofore imported from abroad. 
10. Formation of Metallic Copper by Water and Fire . — In 
making cement-copper in Germany, plates of solid copper are 
obtained, and also reguline copper in the fibrous, capillary, 
dentiform, reniform, and botryoid external shapes ; and in the 
smelting of some sulphurets of copper, fibrous, lamellar, and 
crystallised pure copper are formed. 
11. Effect of Position on Crystallisation.-— Machman, Profes- 
sor of Chemistry at Christiania, in Norway, in a memoir 64 on the 
Effect of the Earth’s Magnetism on the separation of Silver,” 
states, that, in the year 1817, when exhibiting, in a syphon- 
shaped glass-tube, the formation of an arbor Diana, the tube 
having accidentally been placed in the direction of the magnetic 
meridian, he remarked that finer and longer crystals were formed 
towards the north than towards the south, and yet every thing 
was the same in both legs of the tube. The solution of ni- 
trate of silver in both legs of the tube, was in communica- 
tion, while the mercury covered only the bottom of the tube. 
The experiment was again repeated, in presence of Hansteen, 
with two syphon- tubes, one parallel, and the other at right angles 
to the magnetic meridian. The silver began to separate in the 
tube which was placed in the north and south direction, and 
shot out into larger, more numerous, and more brilliant radia- 
tions in the leg towards the north, than in that towards the 
south. In the syphon in the east and west direction no change 
was observed until the expiry of twelve hours. Hansteen after- 
wards repeated the experiment several times, and always with 
the same result, and deduced from his experiments the following 
inferences. 1 . The arbor Dianas is more strikingly developed 
when the tube is placed in the magnetic meridian, than when in 
