Jackson. 954. [December 4, 
Dr. Hagen said that some fifteen years ago Dr. Leidy had 
stated that the female of Perthostoma aurantiaca carried 
her eggs in a simple layer glued tothe upper side of the 
hemelytra, until they were ready to hatch, and then dropped 
the whole layer. Such a habit is exceptional among the 
Hexapoda. Dr. Hagen said it was difficult to conceive how 
the female placed her eggs in this manner. As such speci- 
mens are not rare in the summer, it would be easy to observe 
the habits of these insects, and to hatch the eggs. He ex- 
hibited specimens of the P. aurantiaca with the attached 
egos. He possesses some cast similar layers of eggs from the 
Himalayas; the eggs in one of these layers have all hatched. 
He also showed a number of specimens of Achlysia, the 
nympha of Hydrachna, attached by the head to different 
parts of the body aud legs of Perthostoma and Belostoma. 
December 4, 1872. 
The President in the chair. Twenty-four persons present. 
Dr. C. T. Jackson gave the following results of an analysis + 
of meteoric iron, ete. 
ANALYSIS OF MEtTEorRIc Iron FROM Los ANGELES, CAL. 
The original mass is stated to have weighed éighty pounds, and 
was seen to fall. A slice of it weighing thirty-seven grammes was 
presented to me by Mr. E. N. Winslow, of Hyannis, Cape Cod. The 
specific gravity, taken on the whole piece, was 7.9053. The polished 
surface of the specimen acted upon by diluted nitric acid, instead of 
presenting the usual Wiedmanstatian figures, exhibited innumera- 
ble minute scales of Schreibersite, pretty uniformly mixed with the 
iron, giving the surface a sort of micaceous appearance. 
One gramme was sawed from the specimen for analysis, and was 
dissolved in nitric acid. The insoluble matter when reduced by the 
blowpipe gave of metallic tin 0.01 perct. The oxide of iron sep- 
