358 
Olive. — Sexual Cell Fusions and Vegetative 
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EXPLANATION OF PLATE XXII. 
Illustrating Professor Olive’s paper on the Rusts. 
All the figures were drawn with the aid of the camera lucida, and, except the few specially 
noted below, with Zeiss Apo. Obj. 2 mm. N. A. 1 : 30, combined with Compens. Oc. 12, thus 
securing a magnification of 1500 diameters. Various Compensating Oculars, combined with the 
Apo. Obj. 2 mm. N. A. 1 : 40, were used for those figures in which the magnification is specially 
designated. 
(Except where otherwise stated, all figures are drawn from Triphragmium ulmariae .) 
Fig. 1. Nucleus from a spermogonium, showing on the nuclear membrane and enclosed in an 
archoplasm-like substance, two deeply-stained centrosomes, on each of which a certain amount of 
chromatin is centred. 
Fig. 2. Dividing centres, connected by a slender strand — the central spindle. The nuclear 
