QUARTERLY CHRONICLE OF MICROSCOPICAL 
SCIENCE. 
GERMANY.— Archiv f. Mikroskopische Anatomie, II, 
Heft. 4.—1. The first paper in this number of Schultze’s 
‘ Archiy’ is by Dr. C. Kupffer, “ On the Development of the 
Embryo in the Genus Chironomus.” Adverting to the obser- 
vations of Weismann* “ On the Development of the Dip- 
terous Ovum,” and to Mecznikow’s+ ‘‘ Researches on the 
Embryology of the Hemiptera,” the author states that his 
own observations up to a certain point agree altogether with 
those of the former writer, and with those of the latter to a 
great extent, although at the same time they tend to show, 
when compared with Meckznikow’s statements, that there is 
probably a considerable difference between the mode of 
origination of the so-termed “ folded layer” (Faltenblatt) in 
the Diptera and Hemiptera. Dr. Kupffer’s observations 
have satisfied him that no rupture of the germinal membrane 
takes place, and consequently that the rotation of the contents 
of the oyum around the long axis cannot, as formerly supposed 
by Weismann and others, be due to such a rupture. 
2. * On the Structure of the Eye in the Gasteropoda, and on 
the development of the parts of the Eye in the Animal Series,” 
by V. Hensen.—The author’s observations in the present 
paper have been chiefly made on the eye of Pteroceras, of 
which an excellent account is given. In a former paper,t 
“On the Structure of the Eye in the Cephalopoda,” he had 
already pointed out the chief peculiarities in the structure of 
the visual organ in the cephalophorous Mollusca, and these 
observations haye been confirmed by his more recent re- 
searches. 
The account of the retina is one of the most interesting 
and important parts of the communication, and in this and 
-his account of the structure of the same part in the Cephalo- 
* ¢ Zeitsch. f. wiss. Zoologie,’ xiii. 
t Ibid., xvi, p. 128. 
f Ibid., xv. 
