278 The Botanical Gazette. [July, q 
discussion of the facts which seem to justify the conclusion, Dr. Moll 
says: “The chromatic substance, which will form the segments at a 
early stage leaves the nucleolus and is transferred into the nucle 
plasm. At this stage the nucleolus assumes a modified shape, getting 
pointed at one side and at this point the chromatic substance leaves — 
it, appearing in the nuclear plasm as small fragments, ranged in ® 
intermediate, achromatic thread like the beads of a necklace; and — 
‘thus a skein, containing chromatic substance, is formed. : 
Doubt is expressed as to the origin of the thread linking the chr — 
matic fragments together, but it is thought probable that the thread i 
first formed from the nuclear plasm and that afterwards the chromatia 
flows out into it. The author is inclined to think further that the 
process of karyokinesis in Spirogyra is not essentially different from 
that in higher plants. 
Many other interesting and important de 
can only be appreciated and understood by a careful readi 
entire paper.—D. M. M. 
Tue thirty-fifth contribution from the Herbarium te 
lege is entitled “An enumeration of the plants collected er 
Thomas Morong in Paraguay, 1888-1890,” by Thomas Morong allt 
L. Britton, assisted by Miss Anna Murray Vail. Itis reprinted . ; 
the Annals N. Y. Acad. Sci. vit. 45-280. Dr. Morong's expedition 
South America is arecord of unusual courage and devotion ee 
and this bulky, well wrought contribution is one of its epee roughll 
study of such material is peculiarly difficult and can only bet the 
‘ | to 
done at a few favored places. In this case, recourse was had 
ork could be eo 
Full notes in the field and in the herbarium largely eae si of the ; 
tails are brought out which 
ng of the 
of Columbia Co 
wealth of material,obtained can be had from the age hundred 
hundred and thirteen phanerogams (distributed through me a 
and three families), and fifty-three pteridophytes a pecies 
eighty-three of the former being described as new : 
largest families are Composit (103), Gramine® et norbiace (a 
Cyperacee (47, and only two of them carices), oo aaa Solana 
Solanacex (36), and Malvacee (31)- Euphorbia | 
yielded the largest number of new species. aa Harast 
A RECENT CONTRIBUTION from the Gray Herbart two prene® 
University is announced as no. ll of Ss eae Acad. being ® 
papers published by Dr. Robinson 17 Proc. tains “ Additions 0 
garded as nos.1andu. The present one oe es G, Pringle in 1 
Phenogamic Flora of Mexico, discovered by © 
