198} CURRENT LITERATURE 295. 
4 
dservations of the striking phenomena he describes are extensive and valu- 
ile. Finding the immense destruction of leaves to have been the most 
erous damage done by the storm, he points out the disastrous results of the 
Soppage of the transpiration current and of the manufacture of nutritive 
products at a time when the uninjured roots were at a period of their greatest 
ibsorbingactivity. Where the deficiency in leaf exposure was partially made 
. either by adventitious budding or by premature growth from the leaf axils 
3 the undestroyed twigs of 1896, careful observations were made of the 
smatural “growth ring” thus established. This ring, very evident in the 
_ ‘Savviving twigs, easily traceable in the larger branches of several years for- 
_ Sation, was not to be observed in the main trunk. In very many cases, even 
where the normal functions seemed to have been restored, trees have since 
Ged on account of injuries received by the bark, either by violent wrenching 
wy later intensified insolation. In the latter case, when the temperature 
n wood and bark must have risen to a height which destroyed the 
7a cambium, the bark has since peeled off before the vegetative parts 
te tree have shown signs of withering. Such bark-scorching was almost 
“versal, and Mr. von Schrenk predicts that many of the finest trees for 
ts reason will be unable to stand the strain of another summer. Six plates 
‘mply illustrate the text.—J. G. CouLTER. 
tans * has made an interesting contribution to the subject of 
alyembryony, In Allium odorum he finds embryos developing not only in 
but also from synergids, antipodals, and from the wall 
ml integument. One embryo sac contained five embryos, one nor- 
| a... Hom a synergid, two from antipodal cells, and still another 
nner integument. Many irregularities were noted both in the 
Wa, inthe embryo proper. The stock from which the material 
Cian d been cultivated in gardens for over twenty years.— Cuas. J. 
RLAIN, 
the Rev. Gen. Bot. of June 1897. The contributions reviewed range 
ee t 54 of Chauveaud”® upon polyembryony amon 
a lajeff’s well known study of the phenomena of 
“6 ar 
_-Pstms,* and Guignard’s Nouvelles études sur la fécondation. 
up : 
bet Zeit HEGEL Mater, — Zur Kenntniss der Polyembryonie von Allium odorum- 
Mhnge Sis 1897, 
a f 
in, Py en ndation dans les cas de polyembryonie. 
® “Sahay Soc. d’edit, sci., 1892. 
Seely : t€ von dem Pollenschlauche der Gymnospermen. 
< * 196-201, 1893 b 
n 
Reproduction chez le Tomp- 
Ber. der de utsch. bot- 
nh, sty 
des Sci, Nat, VII. 14: —. 1891. 
