MEMOIR OF THE LATE DR. HENRY. 125 
experiments only as initiatory and as demand- 
ing the confirmation of multiplied and varied 
trials, before being adopted as the basis of legis- 
lative enactments. His feelings of interest had 
_ been so deeply excited in the laws and higher 
physiology of contagion, that he embodied all 
the facts and evidences he had been able to 
glean from a most extensive course of reading, 
in a Report which was communicated to the 
British Association, and has been published in 
their Transactions. 
Dr. Henry’s compass of thought and interest 
was not however restrained within the limits of 
his profession and his favourite branch of know- 
ledge. Of the sciences of classification, he had 
cultivated in early life, with great zeal, both 
botany and mineralogy; and had formed a 
creditable collection of mineral specimens. This 
latter study naturally led him into the kindred 
pursuit of geology. Indeed, his first academical 
residence in Edinburgh coincided with the 
memorable period, when the two rival theories 
were the objects of constant and eager contro- 
versy in all societies, and especially in the higher 
scientific circle, in which Dr. Henry had the 
privilege of moving. Shortly after the forma- 
tion of the Geological Society of London, Dr. 
