PLATE XIII 



FIG. I. PRIMROSES CUT OPEN TO SHOW 

 SHORT AND LONG STYLES 



FIG. 2. CUCKOO-PINT CUT OPEN" TO 



SHOW THE IMPRISONED MIDGES ON 



THE STIGMAS 



FIG. 3. BUMBLE BEE IN THE ACT OF 



POLLINATING AN ORCHID (ORCHIS 

 MASCULA) 



FIG. 4. BEE COLLECTING POLLEN FROM 

 BLACKBERRY BLOSSOM 



