388 riit^ American Geologist. December, i898 
Primary, Secondary, Permian and similar geological terms are as 
much out of place that they indicate a lack of recognition of the broad 
fact that terminology must change with conceptions that have been 
outgrown. 
By wholly ignoring the excellent and extensive labors of his pre- 
decessors professor Haworth has fallen into grievous errors regarding 
many of his new names. It will necessitate herculean "struggles to 
avoid obscurity" of some of them. Marmaton is essentially the same 
subdivision which Bain, several years ago, gave the name Appanoose. 
Erie has been already preoccupied a dozen times. Thayer was a 
term given by Broadhead, 30 years ago, to the same shales at the 
same locality in Neosho county. Broadhead's full an^l lucid descrip- 
tion of identically the same section could be with great advantage to- 
day substituted for the one given by Haworth. Lawrence, lola and 
Cherokee are about the only important titles out of all the numerous 
ones proposed that are likely to stand. Surely, even a little attention 
to previous work would have removed most if not all of the conditions 
"compelling the new invesigator to discontinue some of the terms and 
making it desirable if not necessary for him to introduce others." 
With no consistent principles to be guided by, perhaps little else 
could be expected. There is, at least, no internal evidence that pro- 
fessor Haworth has given the slightest attention to that generally rec- 
ognized principle that terminology reflects systematic arrangement. 
The latter is manifestly an expression of genetic relationship. Classi- 
fication based entirely on convenience is no classification at all. It is 
merely titled chaos. c. R. k. 
Contribution a F etude micrographique des terrains sedimentaires, 
par LuciEN Cayeux. (Memoires de la Soci^te Geologique du Nord. 
tome 4, pp. 589. 10 pis. quarto, 1897. Lille.) 
This is in part a contribution to metamorphism, and it is certainly 
one of the most important that have been made to that subject. It 
has long been known that amongst the older rocks, and especially 
the Archean, the constituent fragmental grains undergo transforma- 
tions which result in new minerals and in compact crystalline rocks. 
In this work the process is studied at its commencement, and in the 
Cretaceous and Tertiary strata. The research is carried on with 
thoroughness and deliberation. In the examination the author has 
included also the microscopic organisms of all the formations de- 
scribed. These formations are the Jurassic and Cretaceous of the 
Paris basin, the Cretaceous of Belgium, the Eocene shales and glau- 
conitic sands of the north of France and the chalk of the Paris basin. 
AH literature on these formations, at least so far as it bears on 
the microscopic structure and organisms, appears to have contributed 
to the wealth of reference and to the grasp of the subject shown by 
the author; and at the close of the volume is an extended bibliography 
embracing 312 works, beginning in 1745 with Linneus and ending 
with Gosselet in 1897. 
