296 Notice of Gas from Cotton Seed. 
flame, but the gas speedily became more luminous, and 
continued of good quality until near the close of the ope- 
ration, minty it began to burn with the blue flame of car- 
bonic o 
It was i Ubviogs that, provided the experiment could be 
30 miners as to convert the oily vapour, which came 
over undecomposed, into gas, the quantity of the latter 
would be sscreaged and its quality improved. That the 
oily vapour constituted no inconsiderable part of the 
whole product, was evident, not only from the appearance 
of the receiver, but also febin the fact that the residuum 
weighed only ninety grains. This was pure charcoal, the 
seeds retaining their perfect form, and the tube being 
quite dry and clean. With the hope of desampogne this 
vapour, our next arrangement was as follows 
qe, ; e same quantity of seed being Gplraduced ar 
before, the tube was ae horizontally : across the furnace 
in such a manner, that ttom containing the seed, pro- 
yected into the open air, hile the upper parts of the tube 
were waised to ared heat. As soon as the heat had so far 
reached the seed as to begin to expel oily vapour, the tube 
was drawn slowly forward into the furnace. A very abun- 
dant evolution of gas immediately ensued, greatly exceed- 
ing the product of experiment 1, though an accident 
prevented my estimating it accurately. In illuminating 
power, however, it was inferior to the former product,— 
a circumstance to be attributed, no doubt, to the effect of 
the upper part of the tube, (which was at a full red heat,) 
in decomposing the olefiant gas into the lighter carburetted 
hydrogen. These hints enabled me to manage this ex 
periment more judiciously. 
Ex. 3. The same arrangement being made as in Ex. 2, 
the part of the tube within the furnace was slowly rais- 
ed to alow red heat, and the oily vapour suffered to 
come into contact with it, as it graduall rose from the 
bottom of the tube, which was still remaining without the 
furnace. As the gas, however, began to fail, the tube was 
drawn very slowly forward as before, notil it lay tite A 
the furnace. This mode, it will be seen, was § 
ted by that E agate by the Messrs. are of Londog 
manufactu oil gas, when the oil is admitted in 
torts” feces at a low red heat, drop bya ro 
