292 
It would seem, therefore, as if the authors 
were in error in asserting that the levator 
ani is inserted ‘into the lateral aspect of 
the prostate,’ ‘into the side of the rectum’ 
or ‘into the walls of the vagina,’ but as in 
its origin, the muscles are attached toa 
narrow linear movable insertion. 
It is more a tensor of the fascia, either at 
its origin or insertion, the fixed point being 
interchangeable, so that it should be called 
the ‘ Tensor perinez’ rather than ‘ Levator 
ani.’ 
Development of the Human Diaphragm: Dr. 
Matt, Baltimore. (Illustrated by dia- 
grams and specimens. ) 
In human embryos four weeks old the 
pericardial and peritoneal cavities freely 
communicate. At this time, however, a 
ridge of tissue is formed in the wall of the 
celom opposite the ductus Cuvieri and 
cardinal veins which grows rapidly and en- 
circle the lungs to form the pulmonary 
ridge. A week later the ridge widens to 
form the beginning of two membranes. 
The first of these, the pleuro-pericardial 
membrane, contains within it the phrenic 
nerve and soon separates the pleural from 
the pericardial cavity. The second, the 
pleuro-peritoneal membrane, grows towards 
the tail with the rotation of the liver and 
the degeneration of the Wolffian body, and 
at the end of the sixth week completes the 
diaphragm. 
Dr. Stroud, of Cornell University, was 
unable to be present. A photograph sent 
by him, showing apparatus for demonstrating 
the circulation of the blood, was passed around 
among the members. 
The apparatus is an imitation of the 
actual blood vascular system. The heart, 
arteries, capillaries and veins are represented 
by a rubber bulb with valves, very elas- 
tic rubber tubing; capillary glass tubing 
and thinner rubber tubing. The bifurca- 
tion of arteries is shown in Y-shaped, of 
SCIENCE. 
[N.S. Vou. XIII. No. 321. 
veins by U-shaped, glass tubes. The circu- 
lation is continuous as in the living body. 
Manometer tubes indicate the difference in 
pressure in arteries and veins. 
Advantages and Limits of the Methods of Recon- 
struction with Wax Plates in Anatomical and 
Embryological Investigations. Dr. CHas. R. 
BarpEEN, Baltimore. (Illustrated by 
specimens, etc. ) 
Discussed by Drs. Huber, Minot, Barker, 
W.S. Miller and Huntington. 
Demonstration of a New Freezing Microtome : 
Dr. BARDEEN. 
Specimen of Cyclopia:. Dr. CArmaxt, New 
York City. (With cast and photographs. ) 
Discussed by Dr. Minot. 
A Caudal Appendage in a Human Infant: Dr. 
Harrison, Baltimore. (Illustrated by 
specimen and photographs. ) 
Discussed by Dr. Hrdlicka. A tail-like 
appendage, measuring 24 inches in length, 
was present in an infant of four months. 
The tail arose close to the tip of the coecyx, 
although not a direct continuation of the 
latter. It contained no cartilage nor bone, 
but did contain voluntary muscle fibers, and 
was movable to a considerable degree. 
Typical Forms of Shaft of Long Bones other than 
the Tibia: Dr. Hrpoiicka, New York 
City. (1llustrated by specimens. ) 
Discussed by Drs. Huber and Hunting- 
ton. The paper presents the further results 
of the writer’s investigations on Professor 
Hunutington’s osteological collection in the 
Medical Department of Columbia Univer- 
sity, New York City. It deals with the 
variations in shape of long bones and classi- 
fication of these shapes in a similar manner 
as the former (1898) communication on the 
tibia. An inference willbe drawn as to the 
causes of the variation. 
Notes on the First and Second Ribs and a Dem- 
onstration of Bicipital, Bicaudal, Notched 
and Perforated Ribs in Man; also Notes and 
