Among the shrub and tree formations there ar 
1898 | CURRENT LITERATURE 451 
to passage through the chalaza. He would look upon the elms as one of the 
transition types from the chalazogams to the porogams. 
Supplementing this work of Nawaschin, N. Zinger has found®* that in the 
ovules of Cannabinez the inner integument, which is elsewhere very delicate, 
over the apex of the nucellus becomes massive and is completely coalescent 
with the thick outer integument. The micropylar canal before fertilization is 
entirely closed by papillary outgrowths from the surface and marginal cells 
of the integuments. These outgrowths form a densely interwoven firm tissue 
above the apex of the nucellus, passing into the tissue of the ovary wall 
above. The pollen tube follows the central cells of the styles (conducting 
tissue ?) downwards, passes along the upper wall of the ovary, penetrates the 
outer and inner integuments or bores through the tissue filling the micropyle, 
and reaches finally the nucellus. Here it produces numerous sac-like tumid 
branches about the apex, until one very delicate tube penetrates to the 
embryo-sac.— OTIS W. CALDWELL. 
A RECENT MONOGRAPHIC work by Adamovic on the vegetation formations 
of eastern Servia adds greatly to our knowledge of the flora of that country.” 
Botanical research in Servia is a matter of the last two decades, because of 
the blighting rule of the Turkish government. The names of Pancic and 
Petrovic are about the only ones that need to be recollected, with the excep- 
tion of that of the author of the monograph under review. 
Servia is a mountainous country in the truest sense, even the river valleys 
being some hundreds of meters above sea level. The mountains belong to 
the Balkan and Rhodope systems and are of various geological ages trout 
Precambrian to Recent. The country is drained by the Morava and Timok 
rivers, tributaries of the Danube. The climate is intermediate between that 
of continental Europe and the Mediterranean climate to the south 
The author first discusses the formations of the plains and ; 
There are extensive rocky pastures, mostly along the slopes of ah 23 
floral covering is sparse and the plants are decidedly xerophilous papers 
and periodic in their life functions. These rocky pastures a 4 
steppes, where the soil is more gravelly or sandy than rocky. ra pees 
these formations euphorbias are characteristic. The meadows are iealvesst 
into valley or true meadows and swampy meadows, the latter grading 
Swamps. Rock formations are quite abundant and closely related to roc : 
pastures, though the rocks are larger and the vegetation se ese 
northern slopes have a richer flora because of greater enews : tr ‘ 
and water formations do not form a very large part of “ noe = i oe 
lower hills. 
*5 Flora 85 : 189-253. 1898. oe 
76 ADAMOVIC, Luso.— Die Vegetationsformation 
Jahrb. 26: 124-218. 1898. 
en Ostserbiens. Engler’s Bot- 
