. Nature . onvincing description of the competition of plantsin nature. Both The Book of Nature Study and Mr. ScottElliots Botany of To-day are worthy of a placeon the bookshelves of every school library. (3) Miss Johnson hasproduced a carefully and, onthe whole, a clearly written , but, lik; manv NO. 2127, VOL. 84] j other books of the kind, it is somewhat deficient inbrightness and suggestiveness. In the opinion of the present writer, it is a mistake to adopt the water-tightcompartment system in the teaching of elementarystudents. The author, however, adheres to the time-worn metho


. Nature . onvincing description of the competition of plantsin nature. Both The Book of Nature Study and Mr. ScottElliots Botany of To-day are worthy of a placeon the bookshelves of every school library. (3) Miss Johnson hasproduced a carefully and, onthe whole, a clearly written , but, lik; manv NO. 2127, VOL. 84] j other books of the kind, it is somewhat deficient inbrightness and suggestiveness. In the opinion of the present writer, it is a mistake to adopt the water-tightcompartment system in the teaching of elementarystudents. The author, however, adheres to the time-worn method of devoting entirely separate sections ofher book to morphology, histology, and physiology. i Thus the external characters, the structure, and thefunctions of a root are treated in quite different partsof the book. Further, bearing- in mind the studentsfor whom the work is intended (vide preface), it issomewhat overcrowded with unnecessary detail. Thebook is fairly free from serious errors, but perhaps it. lhoto.\ may be worth while to direct attention to the factthat the intercellular passages so frequent in thevascular bundles of monocotyledons are not air \gain, the chiej function of the air spaces in the stemsof water plants is scarcely to give lightness to theplant (p. 219), though, curiously enough, this state-ment is also made by Miss Laurie in The Book ofNature Studv (p, 23), reviewed above. The excel-lent illustrations, which are nearly all new, form thebest feature of the book. Tliese are chiefly by MissBoys-Smith and Miss Berridge. 148 NATURE [August 4, 1910 NOTES. Several weeks ago tho nnnauncenienl was made that anItalian Government Commission, appointed to inquire intothe condition of the Leaning Tower of Pisa, had reportedthat the structure was in danger of collapse (July 14,p. 48). We are glad to be able to print in the presentissue the translation of an article by Prof. A. Battelli,professor of physics in the University of Pisa, in whichthe facts wi


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