grown for twenty-one days, attained a growth less than one half 

 that attained by wheat seedlings similarly grown in clean glass 

 sand not previously thus used. More recently Shreiner and 

 Reed * have shown that " healthy growing plants excrete from 

 their roots substances which have a deleterious effect upon the 

 growth of the root." 



It seems not improbable that in these facts may lie a partial 

 explanation of the failure of hemlock seedlings to reach any 

 considerable development under trees of the same species. 



C. Stuart Gager. 



A RARE SEEDLING AT THE PROPAGATING HOUSES. 



Through the kindness of the Director of the Royal Gardens, 

 Kew, we have been so fortunate as to secure several seeds of 

 : wonderful " Tumbo," or Welwitschia mirabilis* The seeds 

 re planted early in April, and at present there are two healthy 

 :dlings, that give every indication of becoming strong and 

 obust examples of their kind. 

 The upper half of the accompanying photograph (Fig. 3 5) shows 

 t two seed-leaves, or cotyledons, as they are called. These 

 rrow spatulate leaves about one and one half inches long 



