- 
‘ean be diminished or even stopped, by cutting off the supply of air to 
‘the grate of the gas- Jae dy and this is important, inasmuch as 
closed, as in the muffle furnaces and flint- -glass furnz 
the same kind of coal is used either directly for the furnace or for 
Leconte 
e abet can ‘hie sapalt of gas mee air is the furnace be cron ee 
by valves in the passages, but the very manufacture of the gas-fuel i 
is no-gasometer to recei e and preserve the aeriform fuel, for it aa 
at once phe: the furnaces. 
S the furnaces have their contents open to the fuel and eombus- 
tion, as in athe puddling and metal-melting arrangements ; other are el 
aces. 
The econo my in the fuel is esteemed practically as one-half, even when : 
d 
gas-producer ; but, as in the latter case, the most worthless kind can be 
employed—such as slack, &., which can be converted into a clean gat 
-eous fuel at a distance from the place of the furnace, so, met eral 
‘seem to present themselves in this part of the arr 
“i 71: On ‘On a i Si for measuring the velocities of ee 
IL 
2. dong iis and classification of the Cephlopia Me 
3. Geographical ei of North pee Birds; 8. .s 
4. On the tables of the Moon; Bens, Per 
: Menor inradg of some Malacopterygians . L, Acasst. 
- On chemical classification; W. Gis 
. a of the Geological survey of "California; J.D. ube 
8. On a method of exhibiting certain statistics of of hosp ’ 
9. eis on the changes which have taken place in ye bar of ‘i 
ton harbor since the sinking of obstructions in the m channel, # 
veloped by the e U.S, Coast Survey; J. E. Hirearp. of 
10. Glacial epee: and present configuration of the Stale 
L. Agassiz, : 
