E. J. BUTLER Ra 
lying below (fig. 5, plate [V ). From these, fine suckers penetrate 
into the leaf cells and kill their contents which are absorbed as food 
Instead of being limited in growth as in Septoglaum Mori, the 
threads ramify over the leaf surface for considerable distances and 
may eventually cover the greater part with their web. 
MULBERRY MILDEW. 
From the superficial web short branches stand up vertically 
into the air. On the top of each of these a single large spore is 
formed (fig. 5). The spread of the fungus from leaf to leaf is due 
to these spores breaking off from their stalks and being blown on to 
