XVI. 
BLAEES 
(between pp. 70 and 71) 
. (upper photograph) Stylets of a Sap-sucking Insect, an Aphis, in Position 
in the Plant Tissue 
(lower photograph) Photomicrograph of a Section through the Oeso- 
phagus and Foregut of an Aphis, showing the Valve which Prevents 
Regurgitation 
. Plant of Chinese Cabbage Infected with Turnip Yellow Mosaic 
. Leaf of a Tobacco Plant Infected with a “Ringspot” Virus 
. Leaf of a Tobacco Plant Infected with the Vein-distorting Virus 
. Leguminous Plant Infected with the Wound Tumour Virus 
. Caterpillar of the Currant Moth (Abraxas grossulariata) Affected with 
a Polyhedral Virus Disease 
I. Photomicrograph of a Section through a Caterpillar of the Currant 
Moth (A. grossulariata) Affected with a Polyhedral Virus Disease 
. (upper photograph) Photograph of a Culture of Bacteria Attacked by 
a Bacterial Virus 
(lower photograph) Octahedral Crystals of the Turnip Yellow Mosaic 
Virus 
. Crystals of the Whole Virus of Turnip Yellow Mosaic compared with 
Crystals of the Nucleic-acid free Component which is not Infectious 
Plate-like Crystals of a Tobacco Necrosis Virus, Photographed under 
Dark Ground Illumination 
. The Electron Microscope (R.C.A.) 
. An Electron Micrograph of the Turnip Yellow Mosaic Virus, Photo- 
graphed by the Gold-shadow Technique 
. An Electron Micrograph of a Bacterial Virus 
. An Electron Micrograph of the Weiss Strain of Influenza Virus 
. An Electron Micrograph of a Frozen-dried Solution of Tobacco 
Mosaic Virus 
(upper photograph) Individual Crystals of Tobacco Necrosis Virus 
Photographed on the Electron Microscope 
(lower photograph) How to Inoculate a Rabbit with a Plant Virus to 
Produce the Antiserum 
