IGO 



THE AMKliR'AN MoMlILV 



[June, 



Generally the first jioticcaMe elVect of the disease is a hrovvnor 

 Mack tliscoloratitm i)!" the leaves (Fij;. i ). those nearest the jjrounil 

 heinj; atVectetl tirst. There soon appears, however, on tlie uiuler 

 surlace ot" the leaves, a whitish down, which spreads rapiiily to the 

 stem, and soon atVects the whole plant. I'nder the microscope the 

 leaf t\mi,'us appears as shown in I'i.i;. 2 The miiuite spores de- 

 \elop in jjre.it mmil)ers and fail to the ground, whence tiie\ are 



Fig. I. Manner of growth of the phytophthora. 



washed into the soil bv rains and thns aflect the forming tubers. 

 The spores are also carried lon<j distances hv the wind, and from 

 one field others for miles aroimd mav he all'ected. The <levelop- 

 ment and jjrowth of Macrosporium is similar to that above given. 

 The remeilv is tc> be found in spraying with the Bordeaux 

 mixture. — American Ai^ricidltttrist. 



Exhibits at the Chicjiffo Exposition. — 1. 



\V. Watson «!v: .Sons, 313 High H(dborn, London, and 78 

 .Swanston street. Melbourne. Australia, are exhiiiiting in the 

 British .Section specimens of the scientific instrmnents for which 

 thev have a world-wide fame, and have sent out from London 

 one of their regular staH' who is conversant with the practical 

 manipulation and will consequently be able to explain the in- 

 struments in a far better manner than a catalogue will do. The 

 principal features of their exhibit are photographic cameras, 

 lenses, and accessories, microscopes and accessories, stereopti- 

 cons, surveying instruments, etc. 



