lievietr of Recoit GvoJotjical Lifcraf urc. 1S8 
sec i\\y'. work tlirough the press: for a sudden and imexpeclfd recurrence 
of a painful disorder, from which he was supposed to bi' thoroughly 
convalescrnt, broujiht his career (o a close. 
Of til is work it would he difficult to speak in terms of jiraisc loo high. 
Till' papers, [lut togetlier from fragmentary miinuscripts, are clear and 
foreihje exposilions of Lewis's observations and conclusions. They are 
libiraljy illustrated by a series of beautiful maps. Lewis had a remark- 
able habit of giving to his field-notes the form of a continuous narrative, 
instead of that of a mere congeries of brief jottings, rarely intelligible to 
a second per.son. such as contents most geologists. The section of the 
book in which the.y are recorded is therefore equal in value to the pa- 
pers themselves. The notes are full of minutely accurate ob.servations. 
with a running commentary of shrewd inferences. They are moreover 
interspersed with extensive references to the glacial bibliography, often 
admirably abstracted, of each district examined: so that they will pro- 
vide, through years to come, guidance both in the field and the study, 
for those who seek to follow Lewis' steps. 
There are points whereon the present writer feels constrained to ex- 
press dissent from Prof. Lewis' conclusions. He states, for instance, 
that Wharfedale in Yorkshire was not glaciated in its lower part, a con- 
clusion difficult to reconcile with the existence of the great i)laiied and 
glaciated surfaces which he himself saw. His ascription, too. of the 
formation of the great chalky boulder clay to the action of shore ice in 
a great extra-morainic lake seems clearly negatived both by the charac- 
ter of the deposit and by the ab.sence of any high ground limiting the 
lake to the southward. The recent discovery there of an astonishingly 
large erratic of chalk, at least one mile in Icngtii, situated many miles 
from the nearest outcrop of the parent rock, is a fact which seems to 
point most clearly to the action of land- (glacier-) ice on a vast scah,'. 
The limits of space forbid a more detailed discussion of tlu' man\ 
merits of this r(!markable book. Suffice it to say that the tendency. 
manif(>sted in England since Lewis' death, to regard with favor his at- 
tempt loestablish a parity lietween theglacial i)iieiiomi'na of tiie Ihllish 
Islands and those of Nortii .\merica, will receive a powerful impulse 
fntm I his w(U'k. i". i-'. k. 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
(hi iirir funiis of iiiiiri/u>, Alf/'i'from the Trenton liiiicxtonr. irilh nhsirra- 
fid/i.y III! liiitliinjrdptDs la.rii><U-A\\. R. P. WniTKiKiii). (Ilni. .\iu. .Mus. Nat. 
llisl.. vol. VI. pp. .'{.") l-:5.^)8, 1)1. XI.) This is one of the most interesting 
and important articles du fossil alg;e which have appeared iti a long lime. 
.\s the author says, there have been so many forms described as alg;e 
whicJi may be worm burrows, tracks, trails or markings du(> to inorganic 
causes, lliat llie finding of fossil alg;e in so old a formation as the 
