$20 General Notes. [ September, 
jected to a searching criticism. Both pangenesis and plastidul- 
perigenesis are rejected as inadequate to explain all the phe- 
nomena of heredity, which, it is argued, can be accounted for only 
by supposing that the germ, Weismann’s Keimplasma, is in fact 
continuous. It is not to be regarded as the final outcome of the 
ontogenesis of each individual, but passes from parent to offspring 
directly, being from the first present in an unmodified form in a 
large number, possibly in all the comatic cells. The germinative 
plasma persists through certain cellular series, concentrating 
itself anew in the embryonic cells of the new organism. Ina word, 
in the phylogenetic development of the organisms the germ, 
whose true seat has now been determined, is perpetuated through- 
out the whole series of successive ontogenies. The generations 
succeed and efface each other, the Keimplasma alone is immortal. 
—Nature, April 1, 1886. 
male has shown a desire to increase his species, but his mate has 
paid no attention to his advances. 
A pair of Chinese mandarin ducks imported by me two years 
ago, when they were a year old, have bred. From seven at 
put under a hen on the last day of June I had four duckling? Pi 
_ July 29th and three infertile eggs. These young birds at 
_ Present writing are strong and lively. I 
__ I have so far been unable to get green-winged teal, although s 
_have offered prices which should tempt men who send these Dit 
