,'rsf«r's&* 





LO.NGITLUINAL SECTION OF A IIAWTIIOKN KLOWEK HI I) 



When a thin slice of a hawthorn flower bud is placed under the microscope, its structure is 

 revealed clearly. The anthers have been cut through, and the pollen-grains within 

 them stand out sharjily as little l)lack dots. The scales which cover the bud on the 

 outside are mfidifud l(';if-i)arts. Ph()tf>niicrograi)h by John Howard Paine. (Fig. 12.) 



