S8 Physiologie. — Cryptogamen im Allgemeinen. — Fungi etc. 



1. Düngung mit Kainit bezw. Superphosphat bedingt eine 

 Steigerung des Kalk- und Magnesiagehaltes der Kartoffel- 

 blätter. 



2. Das Maximum des Gehaltes an Kali und Phosphor- 

 säure tritt zur Zeit der Blüthe oder kurz danach ein. 

 Die übrigen Aschenbestandtheile erreichen ihr Maximum 

 fast ausnahmslos erst zu einem späteren Zeitpunkte. 



3. Das Verhältniss P2O5 : K2O in der Asche beträgt im Mittel 



1 :3— 4. 



4. Die Relation MgO : CaO wurde trotz abgeänderter Düngung 

 und zu verschiedenen Vegetationszeiten fast constant 

 1 : 2-6—2-9 ermittelt. K. Linsbauer (Wien). 



WAGER, HäROLD, The cell structure of the Cyanophyceae. 

 (Proceedings of the Royal Society. Vol. LXXII. 1903.) 



The author has investigated the structure of the cell and 

 nucleus of the Cyanophyceae , using mercuric chloride, 

 Flemming's Solution, Pereny's fluid, alcohol and iodine 

 as fixatives. He has also made observations on the living cell. 

 He does not admit the existence of a differentiated chromato- 

 phore, but states that the coloring matter is contained in minute 

 granules distributed through the cytoplasm. He regards this as 

 a primitive character. He considers the central-body to re- 

 present a nucleus of a simple or rudimentary type. It possesses 

 no definite membrane, but possesses a network structure and 

 contains phosphorus and masked iron. No true mitosis was 

 observed. The paper concludes with a Suggestion as to the affi- 

 nity of the Cyanophyceae to other groups, the author appearing 

 to regard them as being related to Bacteria. 



J. B. Farmer (London). 



Trelease, William, Cryptogamic Botany of Alaska. 



(Harriman Alaska Expedition. V. Cryptogamic Botany. 



March 26, 1904. p. 1—9.) 



An introductory essay by Professor Trelease who served as the 

 editor of Vol. V, Cryptogamic Botany of the Harriman Expedition. The ecolo- 

 gical aspects of the cryptogamic flora are briefly treated, and notes on 

 the economic uses of various algae, fungi, lichehs, mosses, and pterido- 

 phytes are given. In summarizing the work of the several specialists 

 who have contributed to the volume, the Statement is made that „a total 

 of 1616 species of cryptogams may novv be ascribed to Alaska, of 

 which 240 are fungi, 459 algae, 400 lichens, 460 bryophytes, and 57 pteri- 

 dophytes". Maxon. 



Butler, E. J., Report on „Spike" disease among San- 

 dalwood trees. (The Indian Forester Appendix Series. 

 April 1903. p. 1 — 11.) 



This interesting disease the author considers to be due to forced 

 carbon assimilation; a train of modifications in the form of the tree 

 iollowing as a result. 



A „spiked" tree is easily recognised by its narrow pointed leaves 

 densely crowded together. The affected shoot never ceases its growth, 



