Address of Professor Hucley. 387 
nary occurrence, the living parent gives rise to offspring which 
passes through the same cycle of changes as itself—like gives 
rise to like; and this has been termed Homogenesis. By the 
other mode the living parent was supposed to give rise to off- 
spring which passed through a totally different series of states 
from those exhibited by the parent, and did not return into the 
ed. 
.. But the skill of the microscope-makers of the eighteenth cen- 
ry soon reached its limit. A microscope magnifying 4 
diameters was a chef d'euvre of the opticians of that day; and 
only ,';th of an inch in diameter, has, at 10 inches from the eye, 
the same apparent size as an object ;;3,,;th of an inch in dia- 
meter, when magnified 400 times; but forms of living matter 
abound, the diameter of which is not more than ;;};sth of an 
rama put forward by Buffon and Needham in the middle | 
of the eighteenth century. a 
_ When a portion of any animal or vegetable body is infused 
In water, it gradually softens and disintegrates ; and, as it does 
80, the water is found to swarm with minute active creatures, 
