4A2 Scientific Intelligence. 



of the reprint is a supplement of four pages, containing over a 

 hundred additions and corrections. Among these changes, those 

 very naturally predominate which extend the geographical range 

 of species and varieties. Two genera, Franseria and Paulownia, 

 and some dozen species and varieties have been added, being 

 chiefly introduced plants, which have escaped from cultivation 

 within the limits of the Manual. As book-dealers still have a 

 part of the first issue to dispose of, persons especially desiring the 

 corrected reprint should be careful to secure copies containing the 

 four pages 735a, b, c, and d. b. l. r. 



18. Hypertropjhie des lenticelles chez la porame de terre et quel- 

 ques autres plantes ; (Bull. soc. bot. de France, ser. II, tome xiii, 

 pp. 48-50). — In this brief communication to the French botanical 

 society H. Devaux gives an account of a remarkable modification 

 in the development of lenticels when submerged in water. His 

 experiments were chiefly made upon growing tubers of the potato. 

 These he found were " asphyxiated " if completely submerged, 

 but would live and continue their development if only partially 

 covered with water. In the latter case, however, the lenticels, 

 which are rather numerous, underwent a peculiar modification, 

 increasing considerably in size, becoming conical, and opening so 

 that a loose tissue protrudes from within. The interesting feature 

 in the description is that the loose tissue thus formed closely 

 resembles that modification of cork which normally occurs in cer- 

 tain swamp plants, and which H. Schenk has called aerenchyma. 

 It is a secondary tissue characterized by thin-walled cells but 

 slightly attached to one another and separated by very large 

 intercellular spaces filled with air or other gases. As Dr. Schenk 

 has shown, this tissue probably plays an important part in the 

 aeration of submerged or partially submerged plants. The produc- 

 tion of the same sort of tissue in the lenticels of the potato, as de- 

 scribed by Devaux, appears therefore an especially interesting 

 example of the power of adaptation, which a plant may exhibit 

 when placed in unusual conditions of growth. b. l. e. 



19. The Nursery-Book, a complete Guide to the Multiplication 

 and Pollination of Plants ; by Prof. L. H. Bailey. (New York, 

 1891,. 16mo, 300 pp.) — In this neat little volume the author gives 

 concise descriptions of the numerous forms of artificial reproduc- 

 tion practically applied in the cultivation of plants. The various 

 methods of grafting, layering and propagation by division re- 

 ceive their proper attention, and details of manipulation and 

 appliances for work are illustrated by numerous wood-cuts. In an 

 extended alphabetic list of cultivated plants the best methods of 

 propagation to be employed in individual cases are enumerated, to- 

 gether with valuable hints in regard to proper treatment. The 

 closing chapter deals rather briefly with artificial pollination and 

 hybridization. The whole work is a model of clearness and prac- 

 tical simplicity which will make it a valuable aid alike to profes- 

 sional nurserymen and to amateurs in plant-culture. b. l. e. 



