229 The American. Naturalist. [March, 
AN ORGANISM PRODUCED SEXUALLY WITHOUT 
CHARACTERISTICS OF THE MOTHER. 
By Tu. BOVERI. 
[In offering a translation of Dr. Th. Boveri’s paper, entitled 
Ein geschlechtlich erzeugter Organismus ohne miitterliche 
Eigenschaften, I have been guided by two motives. First, to 
make this paper, which will certainly become a classic in 
Biological literature, accessible to American students, since the 
journal in which it appeared “Sitz. d. Gesellschaft für Mor- 
phologie und Physiologie zur München ” X Sitzung am 16 Juli, 
1889, has a very limited circulation in this country. 
In the second place, to point out the new avenues of research 
that such work opens. Results of this kind are of the utmost 
importance, inasmuch as they touch the very heart of the 
question of Heredity. Each advance in our knowledge gained 
by experimental work of this sort, carries forward rapidly our 
understanding of the most vital phenomena of life. 
Results of this importance must be verified over and over 
again, until all chances of error (by no means small) are elimi- 
nated. Dr. Boveri writes that during the present Winter it is 
his hope to carry forward this work at Naples. 
Three small wood cuts were given in the original paper. 
Dr. Boveri has most generously placed at my disposal the orig- 
“inal drawings as well as five additional figures. These are 
added to the present account. The original figures gave side 
views of the Echinus larva, the Spherechinus larva, and the 
side view of the bastard larva (Echinus 4, Spherechinus @ ). 
Three of the new figures give posterior views of the same larve 
and two of the Dwarf Larve. 
Weismann, referring to Boveri’s work, in his essay on Amphi- 
mixis affirms that two spermatozoa enter the enucleated egg to form 
the segmentation nucleus. I wish to call attention to the foot 
note in Boveri’s paper, where it is positively stated that only @ 
single spermatozoon enters the enucleated egg. 
T. H. Moraay. | 
