Correspondence—Prof. T. G. Bonney. AGT 
be briefly summed up as follows :—(1.) Investigations with regard 
to the origin of coal, which resulted in a much clearer understanding 
of the subject than had been current before his time. (2.) The 
establishment of the Laurentian system as a great series of crystal- 
line rocks, divided into several groups, and containing at certain 
horizons evidences of organic life. (8.) The proof of the existence 
of a second series of crystalline stratified rocks (the Huronian) 
resting unconformably upon the Laurentian. (4.) The identifica- 
tion of the various formations of Canada younger than the Huronian, 
and the establishment of the fact that the inferior rocks of the Paleo- 
zoic series rest unconformably upon the Laurentian and Huronian. 
(5.) The production of a number of admirable geological maps, 
giving not only the results of his own explorations and those of his 
staff in Canada, but including the work accomplished by various 
geologists in the other British Provinces and in parts of the United 
States.! 
‘‘Harnestness and singleness of purpose were amongst the most 
marked features of Sir William’s character. From the time that he ~ 
began the Geological Survey until the day of his death, the great 
aim which was perpetually before him was to thoroughly elucidate 
the geology of Canada, and to render the knowledge acquired sub- 
servient to the practical purposes of life and to the advancement of 
his native country.” 
We have to thank Professor Harrington for the interesting volume 
he has produced. If biographies were read more, but we fear that 
they are not frequently referred to, we would say that the perusal of 
the record of such a well-spent life ought to stimulate many to 
become desirous of emulating so noblea man. Of one thing we are 
sure, that out in the wilds, in many a distant and lonely spot, Logan’s 
memory is still warmly cherished by hundreds of Canada’s rough 
but warm-hearted children. 
COQ eS 2 @ IND aN Caen. 
Ean ss 
THE SCHISTS OF THE LIZARD DISTRICT. 
Srr,—In Professor Lapworth’s third part of “The Secret of the 
Highlands,” he refers to an illustration in my paper on the Horn- 
blendic and other Schists of the Lizard District (Quart Journ. Geol. 
Soc. 1883, pl. i. fig. 2,—the reference is incorrectly given by him) as 
evidencing a form of dislocation liable to be mistaken for false bed- 
ding. I feel bound, therefore (as it is implied that I have so mis- 
taken it), to state that the specimen there figured (rather badly) was 
only a fragment broken off from a much larger surface of rock, and 
that I do not think it possible that the structure could be explained 
by any kind of corrugation or shifting whatever, but that it must be 
a record of original stratification. Corroborative instances could be 
found by the dozen in the Lizard district. J am perfectly well 
aware of the simulative structures referred to by Professor Lapworth, 
but can assure him, as the result of a rather extensive experience 
1 See obituary of Logan, GzotogtcaL MaGazine, 1875, Decade II. Vol. II. p. 382. 
