Geology and Mineralogy. 495 
ages connected with the mouth of Trilobites, derived from see- 
3 of ssenee oe of Cal mene senaria, - urus. leurex- 
l 
Brat = the 2 ect position acro oss the he ads is not stated. 
More sections ey needed before the facts observed can be satis- 
factorily interpre 
Mr. Walcott fone also observed in sections of the body of a 
Ceraurus pleurexanthemus what he regards as remains of the ova 
of the animal, similar to those described by Barrande as occurring 
in Barrandia crassa. The space between the dorsal shell and the 
that the question naturally arises whether the ovoidal bodies are 
not of can noite origin 
6. Large Bowlders in a Te Hampshire.—One of the largest of 
about 70,000 ods giving for the te nearly 6,000 tons. Close 
about the sa 
The largest parle in Vermont is called the Green Mountain 
Giant, Pe de on a hill in Whitingham ; it contains 40, eg cubic 
feet.—Daily Monitor, Concord, New Hampshire, Oct 
7. Bo of Org nie Acids to the inesribaiatians of Min- 
erals ; b . Carrineton Borron, Ph.D. 36 pp. 8vo, with one 
plate. New York ‘Acad. Sci., i, 1877. —Professor Bolton presents 
in this memoir the results of a ‘long investigation with regard to 
the action of citric, tartaric, and oxalic acids on minerals, and 
with malic, formic, acetic, benzoic, pyrugstie ce, and picric acids. 
The minerals were subjected to the acids i ad ae wder, the solid 
acids having been made into satarated solution 
From a table in the concluding part of f the memoir, we take 
the talewing reactions of citric acid. CO, is given off when the 
cold acid acts on the mineral carbonates, excepting magnesite and 
siderite which require heat. CO, is also given off, when acting 
with the h cid o sm e, mang and _psilo- 
lane. H,S is liberated when neting with the cold acid on stib- 
nite, nape a sphalerite, pyrrhotite, e hot acid on 
t 
bornite and bournonite as well as the preceding. A jelly is formed 
when the hot acid acts on willemite, datolite, pectolite, calamine, 
natrolite ; and nou-gelatinous silica, when the same acts on wollas- 
lite, rhodonite, analcite, chabazite, stilbite, serpentine, retinalite, 
deweylite’ The following minerals are decomposed by boiling 
