1902} ~ MICROSCOPICAL JOURNAL. 65 
apochromats. These particular lenses were $-inch and 
1-12th inch oil immersions, with N. A. 1:3. Both were 
excellent, but the $-inch was really one of the finest achro- 
matic objectives we have seen, possessing brilliant def- 
inition, whilst the price was only $16. and $22. for the 
1-12th inch. 
Lamps.—Acetylene has not yet been adapted to micro- 
work but the Welsbach mantle and burner have. 
BIOLOGICAL NOTES. 
By L. H. PAMMEL. 
SPERMATOGENESIS AND FECUNDATION OF ZAMIA.—Dr. 
Herbert J. Webber who has for some years made a study 
of Spermatogenesis and fecundation of Zamia has pub- 
lished the most important monograph on the subject that 
has appeared in this country. The more important facts 
brought out in his investigations are that pollination is 
accompanied by the wind, the pollen coming near the mi- 
cropyle of the ovary is carried down further by a mucilag- 
inous material which is evidently extended, and later is 
drawn into the pollen chamber at the apex of the nucellus. 
The mature pollen grain has two small prothallial cells. 
The blepharoplast arise in the central cell being formed 
de novo in the cytoplasm. Small at first they gradually 
increase in size. Shortly after division they are 18-20 
microns in diameter. The kinoplasmic filaments, at first 
very few,increase till they are very numerous. The most 
interesting fact brought out in his studies is that the 
daughter nuclei form the spermatid cells and later become 
metamorphosed into spermatazoids. ‘The entire sperm- 
atid cell is metamorphosed into a spermatazoid, there being 
no differentiation of spermatazoids inside of the mother 
cell.” The mature spermatazoids are the largest known 
to occur in any plant or animal, being readily made out 
without magnification. ‘‘In fecundation the entire sperm- 
