190 Obituary—Professor John Wesley Judd. 
After suggesting that the presence of a considerable amount of 
water in a magma might result in its separation in the liquid state 
into two immiscible portions, the lighter containing the greater part of 
the water and of the more acid and alkaline constituents, representing 
quartz and the alkali felspars, and the heavier consisting mainly of 
the basic constituents with comparatively little water, I continued: 
‘‘Tt was to be expected that the character of the differentiation would 
depend on the amount of water present. If this were larger, one 
would expect a comparatively complete removal of the alkali felspar 
materials.’” [‘‘ With less water one may expect a greater amount of 
the alkaline material to remain with the more basic portion”’], ‘‘ and 
with further differentiation by other processes this would naturally 
give rise to a series of rocks of the alkali or ‘Atlantic’ type. This 
suggestion—it was intended to be nothing more—appeared to derive 
some support from the frequent association of rocks of this character 
with block faulting, while rocks of the normal or ‘ Pacific’ type were 
usually found within areas characterized by folding, where there was 
less facility for the escape of water to the surface.” 
The words in square brackets are those actually used in the first 
draft of the summary of my remarks supplied to the Secretary of the 
Congress. ‘hey were probably modified in the fair copy, but those 
appearing in their place in the printed text do not make sense. 
Indeed, the only meaning that might be extracted from them would 
be exactly the opposite of that intended, as shown by the context. 
A brief but correct version will, however, be found in my contribution 
to the discussion on a paper by Professor P. Marshall (Quart. Journ. 
Geol. Soc., vol. xx, p. 406, 1914). 
It is immaterial for the present purpose whether my suggestion 
with regard to the origin and distribution of the alkali rocks was well 
founded. I merely wish to have it correctly recorded. 
J. W. Evans. 
IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY 
(RoyAL SCHOOL OF MINES). 
March 9, 1916. 
(Spsresay Ops Sg 
PROFESSOR JOHN WESLEY JUDD. 
Many friends and numerous old pupils will deeply regret the death 
of Professor J. W. Judd, who passed away at nis home in Kew on 
March 8. In 1905, when he retired from the Chair of Geology in 
the Royal College of Science, this Magazine published the story of 
his life, with.a list of his many contributions to science, so that it 
will now suffice to continue that story to the closing days. These 
were spent either at Kew or at a small house which he had acquired 
at Walmer; for he had ceased to travel, partly on account of his own 
health, since before retirement he had begun to suffer from a form of 
