oa 
1898] CURRENT LITERATURE 449 
grandmother cells,” as would be necessary in describing the primary 
spermatocytes. 
Ist division x 
/\ 
2d division 
/\ 
3d division 
I central cell 
2-celled spermatogenous complex 
. 4 primary spermatocytes, each containing a 
pair of blepharoplastoids 
, 8 "secondary spermatocytes or spermatid 
A mother cells, each containing two 
blepharcplasts. 
4th division 
+ ¢ 16 spermatids, each containing one 
blepharoplast 
Transformation 
* * 16 spermatozoids 
Naturally the question arises: Is there any relationship between blephar- 
oplasts and centrosomes? The identity of the two structures was conjectured 
by Belajeff and is accepted by Ikeno ; and certainly when one considers their 
similarity in staining reaction, position, size, and divisions, together with the 
analogies which animal spermitogenesis affords, it seems a not unreason- 
able conjecture to suppose the blepharoplast to be a centrosome modified for 
the performance of a new function. Such a view will probably be taken by 
those who share the opinions of Guignard and Schaffner, and by most animal 
cytologists. But those who hold with Strasburger and his assistants that 
centrosome and blepharoplast. Dr. Shaw says: “At present we can only 
express the view that the blepharoplast is a kinoplasmic body set ap 
Purpose of forming cilia."—WILSON R. SMITH. 
SINCE THE ANNOUNCEMENT by Treub in 1891 of chalazogamy 1n Casua- 
tina there has been on the part of morphologists @ persistent interest in 
knowing just how far this process extends in fact and in meaning. It was for 
a time Supposed that the phenomenon is shown by 
was used as the basis of a new classification —the ¢ ye 
by Casuarina, and the porogams represented by all other angiosperms. 
