ZOOLOGY A.ND BOTANY, MICKOSCOPY, ETC. 659 



Nomina nuda.* — E. G. Paris, in a note published after his death, 

 raises a protest against the procedure of certain bryologists in substituting 

 for the earlier suitable names of undescribed mosses new names of their 

 own invention. In illustration he cites instances of which Bescherelle 

 and Mitten were respectively guilty. 



E. G. Paris : Obituary. — T. Husnot publishes an obituary notice 

 of the late E. G. Paris, author of the Index Bryologicus. Born in 1827 

 in Calvados, Jean Gabriel Edouard Narcisse Paris (such was his full 

 name) died at Dinard on April 30, 1911, in his 84th year. He attained 

 the rank of General in the French Army, and retired in 1889. In the 

 sixties he was in close bryological correspondence with W. P. Schimper, 

 and with him prepared a monograph of Cryphaeaceas, with forty plates, 

 which was never published. After leaving the army he settled at Dinard, 

 and published his Index Bryologicus in two editions, and numerous 

 papers on the mosses of the French Colonies in China, West Africa, 

 Madagascar, etc. 



Thallophyta. 

 Algae. 



(By Mrs. E. S. Gepp.) 



Nutrition of Algae. I — 0. Richter writes a book on this subject, 

 which brings together all the latest information and views concerning 

 the nutrition of algas. He divides his book into two parts : I. On the 

 physiological meaning of chemical elements and of certain chemical 

 compounds, as regards nutrition. II. On the influence of certain 

 chemical and physical factors, in the nutritive substratum, on the form 

 and development of algae. Part I. deals with (1) metals, calcium, 

 potassium, magnesium, iron, sodium, manganese, and aluminium, and 

 shows the necessity that they are to certain algae ; (2) non-metals, in- 

 cluding carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur, 

 silica, chlorine, iodine, bromine, fluorine. The second part is divided 

 into (1) poisonous effects of necessary and unnecessary chemical 

 elements and of certain chemical compounds. Under this heading the 

 author treats of Oligodynamic ; Beijerinck's auxanogram-methods for 

 the recognition of poisonous effects ; hastening the growth by chemical 

 irritation ; poisonous effect of arsenic ; etc. etc. Under " The reaction 

 of nutritive solution " the author describes experiments with Knops and 

 other solutions having an acid reaction, and discusses the advantage of 

 a weakly alkaline reaction of the nutritive substratum in algal cultures. 

 Experiments on concentration of nutritive solutions are then described, 

 and the subject discussed very fully : and then a section is devoted to 

 physical conditions in the nutritive substratum. In an appendix of some 

 length, the author treats of the influence of temperature and light on 

 algae, with regard to their culture. A full bibliography and various 

 indices complete this important work. 



* Rev. Bryolog., xxxviii. (1911) pp. 84-6. 

 t Rev. Bryolog., xxxviii. (1911) pp. 93-5. 



t Monogr. und Abhandl. zur Intermit. Rev. Hydrobiol. u. Hydrograph., ii. 

 (Leipzig, 1911) vii. and 192 pp. (figs, in text). 



