AGRICULTURAL BOTANY 165 
on elm. Though a white form is met with, and a dead-white 
form is also mentioned in German floras, as f. nivea, I cannot find 
any record of such a straw-coloured form in floras as occurs at 
Harefield. Mr. Roffey also noticed the plant there last fee 
There is no other character in which the plant differs.—F. 
WILLIAMS. 
REVIEWS. 
ee Botany, Theoretical and Practical. By Jon 
RC F.L.S., Professor of Agricultural Bokaniys 
Dalvectity College, Reading. Fourth edition. 8vo, pp. xiv, 
828, with figs. in text. London: Duckworth. 1910. 
Price 7s. cs ri 
books on hese ral Botany a geen text-books of 
botany with no special aiapaeene, a the wants of students of 
agriculture. Such a charge cannot be brought against Professor 
Percival’s book, and the success with which it has met is proof 
that it has supplied a real want. The book is well known S 
students and teachers of agriculture, and as the original editio 
of 1900 was reviewed in this Journal for that year (p. 359), it is only 
the chapter djonltie with Reproduce tion on Papas n laws of 
inheritance. The recognition of Mendel’s work and its bearin 
on the laws of inheritance has come about since the date of the 
first edition, and the ten pages which Professor Percival now 
devotes to th ect form a brief introduction a subject 
hich i e first import to the scientific student of 
agriculture. A short addition has also been made to the last 
chapter in the tween that fs the work of Bacteria ing the 
last few years a number of plant-diseases pales been attributed to 
7 
‘slate ao ae A. B.. B. 
