858 Recent Literature. 
insists on the intuitive origin of some of the higher mental facul- 
ties. In this we cannot follow him. His pamphlet is written in 
a fair and conciliatory spirit. 
To one who may desire to see the views of two of the advo- 
cates of the originative and selective schools of evolution set 
orth, we recommend the reading of the discussion between Dr. 
Asa Gray and Mr. Romanes which appeared in Nature, closing 
with the number of May 24, 1883. We quote the following 
words from Dr. Gray, which repeat essentially the views ex- 
pressed by Dr. Bennett and ourselves! at various times: 
“I tak 
a, 
gence which innumerable and otherwise inexplicable adaptations 
of means to ends in nature were thought to furnish. If itis not 
so, then the substitute utterly fails. For omnifarious and puei 
casual variation is essential to it in this regard. Fitly 1s it Sat . 
that ‘the theory merely supposes’ this. For omnifarious varie 
tion is no fact of observation, nor a demonstration, or, 1n MY 
opinion, even a warrantable inference from observed facts. It is 
merely an hypothesis, to be tried by observation and experiment. 
* * “But there is no evidence that all sorts of vane ever 
appeared or tended to appear, and there is a musty max! : 
“de non apparentibus eine non existentibus, which is not devoid 
of application.” * * “The upshot is, that so far aS O06 
tion extends, it does not warrant the supposition of omnifarious 
and aimless variation, and the speculative assumption of it appears 
to have no scientific value.” —C. 
laborious work occupies 348 pages, indeed forming near ly ne 
tire volume (xiv) of the Annales des Sciences Naturelles. a 
illustrated by eighteen excellent, sharply-drawn, ne Vial- 
plates. Besides the purely histological treatment, 5% >" pas 
lanes, inspired by the epoch-making work of Went ac- 
made a detailed study of the histological phenomena whic PT 
company the post-embryonic development of insects. a 
The work is divided ‘into three parts. The first compr! 
1 NATURALIST, 1882, p. 457. 
