Chemistry and Physics. 885 
impression. I have endeavored to show that even in what are 
usually considered the more trivial and superficial characters 
presented by natural objects, a whole field of new inquiry is 
opened up to us by the study of distribution and local condi- 
tions. And as regards man, I have endeavored to fix your 
attention on a class of facts which indicate that the course of 
his development has been far less direct and simple than has 
hitherto been supposed; and that, instead of resembling a 
single tide with its advancing and receding ripples, it must 
rather be compared to the progress from neap to spring tides, 
both the rise and the depression being comparatively greater as 
the waters of true civilization slowly advance towards the 
years, we have passed from complete ignorance to almost. per- 
fect knowledge on two such vast and complex subjects as the 
origin of species and the antiquity of man. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMistRY AND Puysics. 
“xposing two or three cubic centimeters to a dro of fuming 
iitric acid. On diluting with water, the characteristic odor of 
exist in minu 
Pylene, butylene, and alivione ava t 
ent, 
