112 
up of the wood vessels with mycelium. Tor this reason Pethy- 
bridge regards it as a type of wilt disease, though the wilting of 
the foliage is rare in Ireland, and he suggests that it should be 
_ removed from the category of ‘Curl ’’ and ‘* Roll’’ diseases, and 
be regarded as a type characterised by the wood vessels being 
infested by mycelium, for which he suggests the term hadro- 
mycosis. 
Much still remains to be learned as to the other sources of Leaf 
Curl and Leaf Roll, but it is highly satisfactory to have a full and 
eareful account of Reinke and Berthold’s Verticillium disease 
san has hitherto received very scant attention in the British 
sles. 
Plants in Health and Disease.—A small work under the 
title “Plants in Health and Disease ’’ has recently been issued 
by the Manchester University Press. The volume represents al 
abstract of a course of lectures designed especially for small 
gardeners and allotment holders, and delivered at Manchester 
University during 1915-1916.* 
‘he first seven lectures were given by Prof. F. E. Weiss, and 
deal with the structure and life of plants in normal health. The 
last ten, five each by Mr. W. Robinson and Dr. A. D. Imms, 
deal with diseases ‘of plants caused by fungi and animals 
vely, 
AAs 18 emphasised in the introduction it is clearly impossible 
within the scope of seventeen lectures to deal in any but the 
thi ay with any of the subjects chosen, but, in spite of 
‘his, the size of the audiences and the interest aroused appeared 
to warrant the publication of the weekly abstracts in book form. 
The lectures are simply and clearl dened 
with technical terms. a th emma oro, and. not bureas 
A. D. 
cnn Moelle cele eee a 
* The Universit PB sui 
8¥0. pp. 143. Price i. sd. 
rete A Eat eae ; = See ree , % 
iysieet ; Tepe Oke ag fe PS 
ee at i ee ea ae eet ae ptt. fet gn Oi ae a bee TAS NS to ere ke. 
tke a 
ves Manchester, 1916, Longmans, Green & Uo. . 
