396 | General Notes. [April 
The mesoderm is characterized in well-preserved germinal 
areas, from eleven to thirteen days old, as a solid mass of cells, 
which is composed of several layers of cells under the germinal 
area, but consisting, outside of the latter, of but a single layer of 
cells. 
The ccelom first appears as clefts in the mesoblast outside of - 
e Berin area, and is pushed in under the latter at a later 
A chordal canal is always developed, and opens at a number 
of points into the cavity of the umbilical vesicle or yelk-sac; 
and opening of this canal into the anterior end of the primitive 
streak was not discovered. Only in an advanced embryo, with 
ten somites, could a slight ectodermal depression be discovered 
at the anterior end of the primitive streak, but this was closed 
below by a máss of cells. 
In front of the medullary groove lies a completely closed mass 
of mesoblast; the interamniotic pore, described by E. van Ben- 
eden and Julin, was not observed in young germinal areas. 
The anterior amniotic fold in the cat, dog, fox, and mole is 
not covered by mesoderm, but consists wholly of ectoderm and 
entoderm. It follows from this that there is found a proamnion 
not only in Rodents, Bats, and Marsupials, but also in Carnivora 
and So ma which it may be concluded that it is a 
structure common to the Mammalia. The Seat micas attached 
to it by Van ponies the author cannot shar 
e Wolffian duct does not arise as a solid cord of cells, but, 
as the author observed in the Duck, as a diverticulum of the 
ceelom; that the ectoderm takes part in the formation of the 
Wolffian duct was not established. 
.- As respects the formation of the maternal placenta, the author 
fully confirms the statements of Bischoff, that the villi of the 
chorion grow into the uterine glands, cooing the latter. 
PHYSIOLOGY. 
riments ig F —In this Bulletin only a 
small part of the details of the experiment are given. A full 
account will appear in the Annual Report for 1886. 
experiments were undertaken— 
_ Ist. To produce flesh at least expense; 
2d. To produce flesh most rapidly, expense not being con- 
sidered; 
ges To produce most edible meat, time and expense not to be 
considered. 
Early in March eight sow pigs were selected and put in pens 
as follows : Pen I, two Berkshires and one Poland China; Pen 2; 
