1875. ] 
THE CUCUMBER DISEASE. 
29 
wliicli the Vibrios were found. When the roots get into this knotted condition, 
the leaves become unable to bear sunshine, and the plants wither, and ultimately 
die away. 
Fig. 1. Diseased Cucumber-root. Fig. 2. Section of one of the Tubercles, enlarged ICO diameters. 
Mr. Worthington Gr. Smith has recently published, in the Journal of Horticul¬ 
ture (whence we borrow the woodcut), a magnified illustration of one of the knots 
or tubercles above referred to, accompanied by the following descriptive notes :— 
“ Our illustration represents, on the left, the diseased roots, natural size; and on the right, 
a thin slice through one of the nodules of the root. The latter is an oxact reflection from 
a camera lucida attached to the microscope, and shows the cellular tissue, A; pitted and 
spiral vessels, b ; the worms coiled up in the eggs, c; worms emerged, d ; and empty eggs, 
e, from which the worms have escaped. Mr. Berkeley refers these parasites to the Vibrios. 
.The parasite appears to belong rather to the oviparous section of tho genus 
