BULLETIN OF THE BUSSEY INSTITUTION. 21 
in the Chemung shales accord very well with the facts that the mate- 
rial from which the shales were formed was deposited in deep water 
and that the fossils found in the shales are not the remains of animals 
such as have bones, Only the casts of sea-shells are to be seen in my 
samples. 
Two of the samples of rocks from Mr. Camp were re-examined, 
for the purpose of obtaining an idea of their general composition. The 
results of these analyses were as follows : — 
Alumina 
No. of the Specimen. Silica. and Lime. Magnesia. 
Ferric Oxide. 
1 (from Baker’s quarry) . . , 69.63%, 22.61 0.3859 (1.42 
mito yeend) 3. . ., 66.46 24.20 0.4785 1.45 
ANALYSES OF Mups FROM DEEP-SEA BoTTOMs. 
With the view of testing the question, whether mud obtained from 
the bottoms of deep seas may not sometimes be equally poor in lime 
with the slates above described, I have examined a number of deep- 
sea deposits and have had quantitative analyses made of several such 
deposits as will appear from the following list. 
Most of the samples of deep-sea soundings accessible to me, ob- 
tained by officers of the U. S. Coast Survey, off the coast of Florida 
and from the course of the Gulf Stream or its vicinity, effervesced 
strongly with acids, and were manifestly so highly calcareous, that no 
information bearing upon the question in hand could have been ob- 
tained from their analysis. 
The samples actually investigated were obtained by Lieutenants 
Brooke and Berryman of the United States Navy, by means of the 
deep-sea sounding-apparatus invented by Lieutenant Brooke. The 
samples belonged to the Museum of Comparative Zodlogy at Cam- 
bridge, and were most kindly placed at my disposal by M* L. F. de 
Pourtalés, Keeper of the Museum. 
In the following list, the numbers of the specimens are those which 
were marked upon them as they came to me from the Museum. ‘The 
depths and places from which the specimens were taken are given in 
the note at the foot of page 22. It is to be observed that the anal- 
yses, though made with the utmost care, are in one sense partial ; 
since no effort was made to estimate the amounts of carbonic acid, 
sulphuric acid, or other ingredients that may have been contained in 
them. In the cases where no determination of potash is recorded, 
