1892.] Noteworthy Anatomical and Physiological Researches. 89 
and female chromosomes were shifted about in such a way 
that some of both kinds were diverted to each pole. 
The two most important theoretical considerations noted, 
are, first, that the nucleus can no longer be considered as tak- 
ing the initiative in the work of cell-fusion but this must be 
given back to the protoplasm from which the directive spheres 
are formed. The nuclei are but passive parcels of hereditary 
substance transmitted from one cell to another and always 
under the dynamic control of the spheres. Second, the 
male and female sexual cells transmit the same number of 
chromosomes and thus indicate that they have an equivalent 
part in the heredity and that the view that the male is merely 
a stimulant or irritant under which the female nucleus takes 
on the character of a segmentation nucleus is not supported by 
the facts of morphology in the case in hand. : 
The article is given a fitting close by ten of those plates 
which are made nowhere but in Paris. In them one can fol- 
low with the greatest ease the investigations of the author and 
alone they constitute no mean addition to the literature of 
mitosis. CONWAY MACMILLAN. 
Burnt spots on leaves.! 
long ago. Burnt spots have been attributed to several patho- 
logical changes, which, although they showed great similarity 
to those caused by a relatively high temperature, nevertheless 
°riginated from quite different factors. : 
ne of the oldest theories to account for these, and as it 
Seems the only acceptable one, was that which ascribed them 
to the common presence of air-bubbles in the glass used as 
“over for green-houses. The air-bubbles were supposed to have 
EDS earpiece 
is a rr I 
R 
2g enor Bencr: Om brennfleckar paa veextblad. Botaniska Notiser. Lund 
- 30 pp. 2 colored plates. 
