1876.] Zoblogy. 627 
Tu a general way, the correlation of size with geographical distribution 
may be formulated in the following propositions : — 
(L) The maximum physical development of the individual is attained 
where the conditions of environment are most favorable to the life of the 
species. Species being primarily limited in their distribution by climatic 
conditions, their representatives living at or near either of their respect- 
ive latitudinal boundaries are more or less unfavorably affected by the 
influences that finally limit the range of the species. These influences 
may be the direct effects of too high or too low a temperature, too little 
or too much humidity, or their indirect effects acting upon the plants or 
other sources of food. Hence the size of the individual generally corre- 
lates with the abundance or scarcity of food. Different species being 
constitutionally fitted for different climatic conditions, surroundings favor- 
€ to one may be very unfavorable to others, even of the same family 
or genus. Hence ei: 
(2) The largest species of a group (genus, subfamily, or family, as the 
case may be) are found where the group to which they.severally belong 
reaches its highest development, or where tt has what may be termed its 
centre of distribution. In other words, species of a given group attain 
their maximum size where the conditions of existence for the group in 
question are the most favorable, just as the largest representatives of a 
species are found where the conditions are most favorable for the exist- 
ence of the species. 
(3.) The most « typical” or most generalized representatives of a group 
are found also near its centre of distribution, outlying forms being gener- 
more or less “ aberrant” or specialized. —J. A. ALLEN, Bulletin 
U. S. Geological Survey of the Territories. 
A GORILLA 1N ENGLAND. — Mr. Moore, Curator of the Free Public 
Museum at Liverpool, sends the following letter to Zhe London Times of 
ne 23d: — 
“Sir, — A veritable young living gorilla was yesterday brought into 
Liverpool by the German African Society’s Expedition, which arrived 
~ Steamship Loanda, from the West Coast. The animal is a young 
‘ all ears, and thick fingers, cleft only to the second joint, distinguish it 
oe kably from the chimpanzee. Only one other specimen has been 
a ht alive to England. In the winter of 1855-56 a young female 
2% of much smaller size, was exhibited by the late Mrs. Wombwell 
w Waterton, of Walton Hall, who preserved the skin for his own col- 
ama sent the skeleton to the Leeds Museum. This specimen I 
e ng in Liverpool and dead at Walton Hall. All subsequent at- 
: Brite, to import the gorilla alive have failed; and, unfortunately, the 
=, Public will have no opportunity of profiting by the present suc- 
