320 
POPULAR SCIENCE REVIEW. 
or rather did not exist in the prehistoric fauna. The post-pliocene masto- 
donts, macrauchenice, and toxodonts of Brazil, its many gigantic armadillos 
and sloths, could well rival the elephants, rhinoceros, and hippopotami, 
which during the same period roamed the soil of Europe.” 
Irifiuence of Comhined Volcanic and Denuding Agencies in 'producing 
.Scenery of Scotland. — At a meeting of the Geological Society of Glasgow, 
on April 2, a paper hy Mr. Powrie, on the above subject, was read at the 
meeting, by Dr. Page. Mr. Powrie is opposed to the views both of Mr. A. 
Geikie, and of the Duke of Argyll, and has offered facts and arguments 
against both of his opponents. 
Geologists, and their Labours . — The following valuable table, which has 
been drawn up by Mr. George W. Ormerod, shows, almost at a glance, 
how vast is the number of scientific men who have devoted themselves to 
geology of late years. In addition, it has considerable importance as a 
means of reference to published papers on geological questions. The latter 
have relation only to the Quarterly Journal and Transactions of the Geological 
Society of London : — 
Titles of Pa- 
pers in Index. 
]807 to 1855 
(inclusive). 
49 years 
Titles of 
Papers 
in Supplement. 
185H to 1867 
(inclusive). 
12 years 
Authors of 
Papers 
in Index. 
1807 to 1855 
Authors of 
Papers in Supplement. 
1856 to 1867 
Tertiary & Recent. 
675 
436 
310 
( 31 Old authors 
1 273 New „ 
Secondary . . . 
693 
434 
330 
/ 45 Old „ 
1229 New „ 
Palaeozoic . . . 
658 
397 
273 
, 47 Old „ 
1 184 New „ 
Metamorphic . . 
190 
112 
104 
1 13 Old „ 
t 54 New „ 
Volcanic .... 
288 
170 
145 
, 21 Old „ 
i 85 New „ 
Plutonic .... 
180 
110 
101 
r 12 Old ,, 
1 63 New „ 
Topographical . 
Geology . . . 
232 
109 
179 
1 6 Old „ 
1 81 New „ 
Miscellaneous . ; 
Mining, &c. . . . 
216 
144 
144 
j 13 Old „ 
1 83 New „ 
- Palaeontology . > 
General . . . i 
23 
16 
13 
f 1 Old „ 
1 11 New „ 
Fauna . . . . 
493 
353 
162 
j 29 Old „ 
1 102 New „ 
Flora 
80 
60 
39 
J 8 Old „ 
1 25 New „ 
The Volcanic Eruption of Central America . — It was stated in certain 
journals that the eruption which M. Ramon de la Sagra described to the 
Drench Academy, on Ma)*^ 4, occurred at Nicaragua. This is a mistake. 
The volcano was that of Conchaqua. This volcano faces that of Coaiguina. 
