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Geology and Natural History. 223 
and red tourmalines from Paris, Me., or the beryls filled with 
orthoclase, or the zircon and gaent ‘filled with calcite, and can- 
not be explained rationally as examples of association and 
envelopment. 
To a strength to his statements, however, Dr. Hunt says 
that he had “examined” with me “ the extensive pon ree of 
sieacinatis upon which my conclusions were based.” Dr. 
Hunt favored me with a visit, I was in hope that he would sachin 
specimens, but his time was so short that he saw only about 
one-third of them, a nd the “examination” (/ ?) of these was 
€8. 
As to his last sentence, I must confess that I am unable to 
discover the least parallelism elie the Pt mR veins 
and the nitic veins, _ eryl and tourmaline, so common in 
untains, and the calcareous veinstones with apatite, 
fessor Dana would express it, “a psewdomorphism on a broa 
scale,” 
— of Pennsylvania, July 4th, 1874. - 
Note on the Enemies of Difflugia; by J. Luiwy. (Proce. 
jae ‘i Sci. Philad., p. 75, 1874. \ Prof ‘Tia remarked that in 
the st of Diffug ia and Ameba we would suppose that 
never with a Diflugia. Worms bral many of the latter, and 
I oan —— observed them within the intestine of JVais, 
hetogaster, and Asolosoma. 1 was surprised to find 
that ren polymorphus was also fond of Diflugia, and I have 
uently observed this animaleule containing them. On one 
on a gia 
The Stentor contracted, and suddenly elongated, and repeat 
these movements until it had split three-fourths the length of its 
body through, and had torn itself loose from the fastened Diffiu- 
; Sid the Stentor suffer from this laceration of its body, 
for in the course of several hours each half became separated as a 
distinct individual. 
oe a on the Revivification of Rotifer euigaes ; ; by J. 
Ler (Ibi —Prof. Leidy remarked that during the 
search for Rhizopods, havin noticed among the aut sahesiog to 
the mosses in the crevices of our Yr udgari man 
observations relating to the assertion 
on moiatening them after they had re dried up. 
slides, containing beneath cover glasses som e dirt, 
exhibited each about a dozen active living Rotifers. The glass 
