30 NATURAL SGIENGE. JaN., 1893. 
constant proof of the patience, industry, and acumen of the author. 
“The progress of Paleontology since 1830,” he wrote in 1866, ‘has. 
brought to light many missing links unknown to the founder of the 
science. My own share in the labour led me, after a few years of 
research, to discern what I believed, and still hold to be, a tendency 
to a more generalised or less specialised organisation as species recede 
in date of existence from the present time.” 
AGNES CRANE. 
(To be continued next month by an account of Siv Richard Owen’s 
Researches on the Vertebrata. ) 
