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THE AMERICAN XATFRALIST [Vol. XLI 



purely ar})itrary, hut it iu.licates a possible uio<le of dexelopmeut. 

 The lower pair of leaflets m h is close to the stipules; in r nn.l d 



sively orcater. Tu r oue stii)ule is enlari^ed aud leaf-like at its tip, 

 havitiu- a coarsely serrate upi)er uiargin and contaiuint; a mid-rib; 

 ill / ihcrc is a complete leaflet close to the sti])ule. 0, h and i 

 show an imperfectly developed ])air of leaflets in relation with the 

 stipules. ./ and /.: have a perfect pair close to the sti})ules, and in 

 / and m this third pair is more distally placed since the i)etiole is 

 lon<rer. lluis the series su/rgests that the third pair of leaflets 

 is tleveloped from the outer porti(m of the stipules. Forms sliow- 

 hvr the similar additi(m of a fourth pair of leaflets may cnsil\ he 

 obtained, to<;cther with those which present the fiist and second 

 pairs in relation with the stipules. In the leaf a there is an un- 

 paired fourth leaflet on the rifjht, V)ut the sti|)ule on the left is 



From the examination of mature rose leaves it a[)pears, there- 

 fore, that leaflets are adde.l from the stipules. Tt would be in- 

 ferred that the basal leaflet^ are the ia^t to dcNclop, but that the 

 stipules arise before the first pair ..f lat.Tal Icafiris. lu the rose 



