ie 
& 
that it would require a very considerable amount of abrasion to 
obliterate them. 
3. C. Zenkeri, (n. sp.) This is a new species recently discoy- 
ered in the magnesian limestoné near Quebec. It will proba- 
bly be described in the next No. of the Canadian Naturalist and 
Geologist. 
4. There is in the collection of the geological survey of Can- 
ada, a plaster cast of the surface of a fragment of rock which 
holds four specimens of a trilobite, each about the size of C. an- 
tiquatus, They appear to me to belong to the genus Conocepha- 
lites. The original specimen was collected in Newfoundland; in 
_ the same slate that holds Paradoaides Bennettii Serr and I 
_ minformed that it is in the possession of a gentleman who lives 
somewhere in the United States, but whose name or place of re- 
sidence, I have not been able to ascertain. 
_ Of the above four species, Mr. Bradley’s is at present the most 
important as it fixes indisputably, at least one point in the geo- 
logical range of the genus on this side of the Atlantic. In Europe, 
Conocephalites has not been found out of the primordial zone of 
Barrande, but the Quebec and Keeseyille specimens show that 
here it reaches the Lower Silurian. 
Montreal, July 25th, 1860. 
Arr. XXV.—On the Combustion of Wet Fuel, in the Furnace of 
Moses Thompson ; by B. Sint an, Jr., Prof. Gen. and App. 
Chem. in Yale College. 
[Read before the Am. Assoc, for the Adv. of Sci., at Newport, August, 1860.] 
Iv all ordinary modes of combustion, it is well known that 
© use of wet fuel is attended with a very great loss of heat, 
Tendered latent in the conversion of water into steam. AS the 
most perfectly air dried wood still contains about 25 per centum 
of water, according to the experiments of Rumford, the term 
wet fuel might seem appropriate to all fuels, but mineral coal and 
: al. But technically, this term is restricted to Cea 
ike peat and those residual products of the arts which, like 
best econom agit lves chemical reac- 
mical results: but which as it involves chemica 
Hons never before, it is believed, successfully applied for such 
B. Silliman, Jr., on the Combustion of Wet Fuel. 243 
4 
: 
