184] 
writer in 1874 (Chemical and Geological Essays, pp. 298, 299). It 
may be conveniently designated as the crenitic hypothesis (from the 
Greek «py»ézys, pertaining to springs or fountains). All veinstones 
and deposits from mineral springs are of crenitic origin. 
It was farther shown that the upward lixiviation of the 
primitive mass, and the deposition over it of an acidic granite-like 
tock would leave below a highly basic material, and that the 
division of the mass thus established would correspond to that of 
the trachytic and doleritic magmas which have been conjectured 
to be the sources of two great types of eruptive rocks. Inasmuch, 
, as according to the present hypothesis these two layers 
of basic and acidic matters are the results of aqueous action, and 
Rot of an original separation in a plutonic mass, as imagined by 
Phillips and Durocher, their composition would be subject to 
Many local variations. The secondary origin of the materials of 
_ Stuptive rocks has long been maintained by the writer, who finds 
the source of certain of them in the underlying basic layer left 
by the partial solution of the primitive mass; which now forms, it 
- believed, a plastic stratum between the solid anhydrous nucleus 
nd the solid crust. : 
Editors’ Table. 607 
— 
EDITORS’ TABLE. 
EDITORS A. S. PACKARD, JR., AND E. D. COPE. 
or trofessor A. Weisman, who has recently published a 
_ “dure on inheritance, and another on the duration of life, has 
; = attacked from the biological, če. inductive point of view, those 
7 ultimate Problems which so often arise in the minds of thoughtful 
| i is life and death? His tract was when first read as an 
E gp iC Programme, entitled “On the Perpetuity of Life.” It is 
— the author that in the protozoa, or one-celled animals, 
i cannot speak of a natural death in connection with these lowest 
“anisms, for there is no observable end to their phases of de- 
mement which is comparable to the death of the higher, 
ap Sled animals. In the protozoa there is no origin of new 
48 resulting in the death of the parent, but as seen in the 
on of any infusorian, neither of the new individuals is 
°r younger. Thus there arises an unending series of 
, €ach one of which is as old as the species itself, each 
